New York attorneys O’Brien, Anne Patricia to Obrien, Timothy J.
By surname, as the register spells it
- Attorneys
- 300
- Register file
- Sep 29, 2026
300 living attorneys on the register file of Sep 29, 2026, part 2 of 23 of the O surnames. Each row is the register's record: the registration number, the year admitted, the status, the office and the employer. 90 link to a page of their own.
O’Brien, Anne Patricia to Obrien, Timothy J.
| Attorney | Registration No. | Admitted | Status | Office | Employer | Law school |
|---|---|---|---|---|---|---|
| Anne Patricia O’Brien | 2687523 | 1995 | Currently registered | Farmingdale, NY | Carman, Callahan & Ingham, LLP | St. John’s University School of Law |
| Annie Mahoney O’Brien | 5633904 | 2018 | Currently registered | New York, NY | Memorial Sloan Kettering Cancer Center | Catholic University of America, Columbus School of Law |
| Austin Patrick O’Brien | 5766944 | 2020 | Currently registered | Atlanta, GA | Hill, Kertscher & Wharton, LLP | Fordham University School of Law |
| Bernadette Agnes O’Brien | 2645158 | 1995 | Currently registered | University of Miami School of Law | ||
| Brendan Obrien | 1443316 | 1966 | Currently registered | Columbia Law School | ||
| Brendan Daniel O’Brien | 4913786 | 2011 | Currently registered | Manchester, NH | Primmer Piper Eggleston & Cramer PC | Boston College Law School |
| Brendan James O’Brien | 5687223 | 2019 | Currently registered | New York, NY | Sullivan & Worcester LLP | St. John’s University School of Law |
| Brendan Regis O’Brien | 2487007 | 1992 | Delinquent | Tulane University Law School | ||
| Brett John O’Brien | 4993663 | 2012 | Currently registered | Washington, DC | National Security Law Firm, LLC | Case Western Reserve University School of Law |
| Bryan Paul O’Brien III | 5873823 | 2021 | Due to re‑register | Duke University School of Law | ||
| Caitlin Kallen O’Brien | 5478631 | 2017 | Currently registered | Albany, NY | Albany County | Albany Law School |
| Caitlin Teresa O’Brien | 5062492 | 2012 | Currently registered | New York, NY | Blackrock, Inc. | Yale Law School |
| Callen John O’Brien | 4014593 | 2001 | Suspended, delinquent | Sydney NSW, Australia | Minter Ellison | UNSW Sydney Faculty of Law and Justice |
| Cara Hobbs Obrien | 4724860 | 2009 | Currently registered | Castle Pines, CO | Thomson Reuters | New York Law School |
| Carolyn Marie O’Brien | 2820165 | 1997 | Currently registered | Los Angeles, CA | St. John’s University School of Law | |
| Casey Merriam O’Brien | 5414446 | 2016 | Currently registered | New York, NY | Amazon | Roger Williams University School of Law |
| Catherine Zucal O’Brien | 2527679 | 1993 | Currently registered | Garden City, NY | C/O Meyer Suozzi English & Klein PC | St. John’s University School of Law |
| Charles O’Brien | 1975804 | 1985 | Suspended, delinquent | New York, NY | Charles Obrien Esq | Rutgers Law School |
| Charles Edward Obrien | 1328889 | 1976 | Due to re‑register | Albany Law School | ||
| Chase Connor O’Brien | 6296370 | 2026 | Currently registered | George Washington University Law School | ||
| Christopher O’Brien | 1726298 | 1981 | Currently registered | Tokyo, Japan | Stonehenge Partners Limited | University of Pennsylvania Carey Law School |
| Christopher O’Brien | 2761732 | 1996 | Currently registered | Albany, NY | New York State Dept of Taxation & Finance Office of Counsel | Syracuse University College of Law |
| Christopher Anthony O’Brien | 5301957 | 2015 | Currently registered | Lees Summit, MO | Christopher A. O’Brien, PA | Elisabeth Haub School of Law at Pace University |
| Christopher Coll O’Brien | 2544500 | 1993 | Currently registered | Albany Law School | ||
| Christopher J. O’Brien | 2241909 | 1989 | Currently registered | Amherst, NY | O’Brien & Ford, PC | Washington and Lee University School of Law |
| Claire Elizabeth O’Brien | 5577770 | 2018 | Currently registered | New York, NY | Selendy Gay PLLC | Cornell Law School |
| Claire F. Obrien | 1912195 | 1984 | Currently registered | Fordham University School of Law | ||
| Clara O’Brien | 4277760 | 2004 | Currently registered | Utica, NY | Legal Services of Central New York, Inc. | Fordham University School of Law |
| Clare Obrien | 2084887 | 1986 | Due to re‑register | New York, NY | A&O Shearman | Trinity College Dublin School of Law |
| Colin Casey O’Brien | 4248217 | 2004 | Due to re‑register | San Francisco, CA | Earthjustice | Yale Law School |
| Colleen Michelle O’Brien | 4620704 | 2008 | Currently registered | New York, NY | Jane Street | Harvard Law School |
| Connor Dean O’Brien | 6027155 | 2023 | Currently registered | New York, NY | New York University School of Law Library | University of Pennsylvania Carey Law School |
| Connor Jane O’Brien | 2093573 | 1987 | Currently registered | Rochester, NY | Empire Justice Center | Syracuse University College of Law |
| Conor Riley O’Brien | 4760005 | 2010 | Currently registered | New York, NY | Thomson Reuters | Boston College Law School |
| Dahlia Y. O’Brien | 3053337 | 2000 | Due to re‑register | Brooklyn Law School | ||
| Daniel Farrell O’Brien | 5640248 | 2018 | Resigned | St. Thomas University Benjamin L. Crump College of Law (Florida) | ||
| Daniel J. Obrien | 2125458 | 1987 | Suspended, delinquent | New York, NY | Curtis Mallet Preuost Colt & Mosle | |
| Daniel Joseph O’Brien | 5111562 | 2013 | Suspended, delinquent | Bethesda, MD | Boston Consulting Group | Harvard Law School |
| Daniel Patrick O’Brien | 1881481 | 1983 | Currently registered | Nesconset, NY | Daniel P Obrien | Widener University School of Law |
| Daniel Patrick O’Brien | 4646287 | 2008 | Suspended, delinquent | San Francisco, CA | Administrative Office of the Courts | Northeastern University School of Law |
| Daniel Paul O’Brien | 2655942 | 1995 | Delinquent | Washington, DC | Amnesty International | Harvard Law School |
| Daniel Peter O’Brien | 2641165 | 1994 | Currently registered | Rochester, NY | Daniel P. Obrien | Temple University Beasley School of Law |
| David G. O’Brien | 1340702 | 1976 | Currently registered | Perkasie, PA | Law Office of David G. O’Brien | Fordham University School of Law |
| David Gerard O’Brien | 2796183 | 1997 | Currently registered | Boston, MA | Peabody & Arnold LLP | New England Law Boston |
| David Hugh Obrien | 3899424 | 2000 | Suspended, delinquent | New York, NY | Willkie Farr & Gallagher | Fordham University School of Law |
| David K. Obrien | 2790772 | 1983 | Currently registered | University of Maine School of Law | ||
| David W. O’Brien | 5525571 | 2017 | Currently registered | New York, NY | Giskan Solotaroff & Anderson LLP | Fordham University School of Law |
| Dawn Marie O’Brien | 3017217 | 2000 | Due to re‑register | Mineola, NY | Nassau County County Attorney | Boston College Law School |
| Deborah Damm O’Brien | 1428184 | 1978 | Currently registered | Albany Law School | ||
| Debra Elizabeth O’Brien | 2223634 | 1987 | Currently registered | Flushing, NY | Debra E. O’Brien, Esq. | UC Law San Francisco (formerly UC Hastings) |
| Deirdre M B O’Brien | 2783157 | 1997 | Currently registered | Kilkenny, Ireland | O’Brien & Associates Law Office | |
| Deirdre Mary O’Brien | 5061577 | 2012 | Currently registered | Dublin, Ireland | Google Cloud Emea | University of Galway School of Law |
| Denise Obrien | 1167915 | 1979 | Due to re‑register | Garden City, NY | Denise Strain, Esq. | St. John’s University School of Law |
| Dennis Anthony O’Brien | 2731867 | 1996 | Due to re‑register | Charlotte, NC | Maersk Inc. | University of Virginia School of Law |
| Dennis Michael O’Brien Jr. | 2989150 | 2000 | Currently registered | Chester, NY | Dennis M. O’Brien, JR | New York Law School |
| Dennis Patrick O’Brien | 4210100 | 2004 | Currently registered | Westbury, NY | Frazer & Feldman, LLP | Brooklyn Law School |
| Devanne Margaret Christine O’Brien | 5390554 | 2016 | Currently registered | University of Ottawa Faculty of Law | ||
| Diana Louise O’Brien | 2379691 | 1990 | Currently registered | Alexandria, VA | Chase Consulting Group, LLC | Columbia Law School |
| Diane Jeanette O’Brien | 2413714 | 1991 | Currently registered | Washington, DC | U.S. Court of Appeals for Veterans Claims | Brooklyn Law School |
| Donald John Obrien | 1372994 | 1979 | Currently registered | Maurice A. Deane School of Law at Hofstra University | ||
| Donald W. O’Brien | 1417492 | 1978 | Currently registered | Rochester, NY | Woods Oviatt Gilman LLP | University at Buffalo School of Law (SUNY) |
| Douglas Gifford O’Brien | 4229787 | 2004 | Currently registered | Indiana University Maurer School of Law | ||
| Duncan T. Obrien | 2127975 | 1987 | Currently registered | Boston, MA | Sullivan & Worcester LLP | Harvard Law School |
| Dustin John O’Brien | 5399191 | 2015 | Currently registered | Newark, DE | Jpmorgan | CUNY School of Law |
| Edmond Patrick O’Brien | 2907558 | 1998 | Due to re‑register | New York, NY | Dorf Nelson & Zauderer LLP | Fordham University School of Law |
| Edward Martin O’Brien | 1844885 | 1983 | Currently registered | Rochester, NY | Nys Attorney General’s Office | Syracuse University College of Law |
| Eileen Campbell Obrien | 2950608 | 1999 | Currently registered | CUNY School of Law | ||
| Eileen Marie O’Brien | 3011525 | 2000 | Currently registered | Bethesda, MD | Bramnick Creed LLC | University at Buffalo School of Law (SUNY) |
| Elizabeth A. Obrien | 2078608 | 1986 | Suspended, delinquent | Morristown, NJ | Shanley & Fisher PC | Rutgers Law School |
| Elizabeth Ann O’Brien | 2426773 | 1991 | Suspended, delinquent | New York, NY | Citigroup Global Markets Inc. | Georgetown University Law Center |
| Elizabeth B. O’Brien | 5431101 | 2016 | Due to re‑register | New York, NY | The New York Genome Center | University of Pennsylvania Carey Law School |
| Elizabeth G. O’Brien | 5972088 | 2022 | Due to re‑register | New York, NY | Windels Marx Lane & Mittendorf, LLP | Rutgers Law School |
| Elizabeth Mary O’Brien | 2697027 | 1995 | Suspended, delinquent | Dublin, Ireland | ||
| Elliott Patrick O’Brien | 6111462 | 2024 | Currently registered | Washington, DC | Milbank LLP | Georgetown University Law Center |
| Emily Shain O’Brien | 4176392 | 2003 | Suspended, delinquent | Chicago, IL | Tulane University Law School | |
| Erika Bree O’Brien | 4397030 | 2006 | Currently registered | New York Law School | ||
| Erin A. O’Brien | 4362182 | 2006 | Due to re‑register | Melville, NY | Suris & Associates, LLP | CUNY School of Law |
| Erin Jane O’Brien | 4779872 | 2010 | Currently registered | Maurice A. Deane School of Law at Hofstra University | ||
| Eugene Andrew O’Brien Jr. | 4749966 | 2010 | Currently registered | Elisabeth Haub School of Law at Pace University | ||
| Evan James O’Brien | 5340583 | 2015 | Currently registered | Burlington, VT | Downs Rachlin Martin PLLC | University of Virginia School of Law |
| Fee Hing Obrien | 1830363 | 1982 | Suspended, delinquent | New York, NY | Obrien & Obrien | |
| Fern Elizabeth O’Brien | 2557858 | 1993 | Suspended, delinquent | Boulder, CO | O’Brien Law P.C. | Rutgers Law School |
| Francis D. Obrien | 1334598 | 1961 | Resigned | University at Buffalo School of Law (SUNY) | ||
| Gary David O’Brien | 3024742 | 2000 | Currently registered | Elmsford, NY | Gary O’Brien, Esq. | New York Law School |
| Gavin Francis O’Brien | 5993340 | 2022 | Currently registered | Islandia, NY | Lewis Johs Avallone Aviles, LLP | St. John’s University School of Law |
| Gerard J. O’Brien Jr | 2182848 | 1988 | Resigned | Catholic University of America, Columbus School of Law | ||
| Grace Charlotte O’Brien | 6251375 | 2025 | Currently registered | New York University School of Law | ||
| Gregory Boegel O’Brien | 5709720 | 2019 | Currently registered | New York, NY | New York City Law Department | Fordham University School of Law |
| H Michael Obrien | 1772227 | 1980 | Currently registered | Elisabeth Haub School of Law at Pace University | ||
| Heather M O’Brien | 5758818 | 2020 | Due to re‑register | Newport Beach, CA | Blackrock | Rutgers Law School |
| Hunter Douglas O’Brien | 5384268 | 2015 | Currently registered | New York, NY | American Express | Campbell University Norman Adrian Wiggins School of Law |
| J Kevin Obrien | 1586981 | 1972 | Currently registered | New York University School of Law | ||
| J. William O’Brien II | 1623511 | 1979 | Currently registered | Elmira, NY | J. William O’Brien II | New York Law School |
| James A. O’Brien III | 3005881 | 2000 | Currently registered | Roseland, NJ | Carella, Byrne, Cecchi, Olstein, Brody & Agnello, P.C. | New England Law Boston |
| James C. O’Brien | 2971711 | 1999 | Currently registered | Washington, DC | Seyfarth Shaw LLP | New York University School of Law |
| James David O’Brien | 2356962 | 1990 | Delinquent | Trinity College Dublin School of Law | ||
| James F. O’Brien | 1642800 | 1979 | Currently registered | Jericho, NY | Law Office of James F Obrien | University of the Pacific McGeorge School of Law |
| James Francis O’Brien | 2344281 | 1990 | Due to re‑register | White Plains, NY | Wilson Elser Moskowitz Edelman & Dicker LLP | Elisabeth Haub School of Law at Pace University |
| James J. O’Brien | 3994365 | 2001 | Delinquent | Santa Fe, NM | Georgetown University Law Center | |
| James Michael Obrien | 2018208 | 1985 | Disbarred | Fordham University School of Law | ||
| James P. O’Brien | 1702562 | 1981 | Currently registered | Binghamton, NY | Coughlin & Gerhart LLP | Syracuse University College of Law |
| James P. O’Brien | 2680189 | 1995 | Currently registered | Ridge, NY | Law Office of James P. Obrien | Albany Law School |
| James P. O’Brien | 4054912 | 2002 | Due to re‑register | New York, NY | Aig | Chicago-Kent College of Law |
| James Preston O’Brien Jr | 2651594 | 1995 | Currently registered | Rockville Centre, NY | Catholic Health | |
| James S. O’Brien Jr | 2104602 | 1987 | Currently registered | New York, NY | Pryor Cashman LLP | Tulane University Law School |
| Jane Baek O’Brien | 4430369 | 2006 | Due to re‑register | Washington, DC | Paul, Weiss, Rifkind, Wharton & Garrison LLP | New York University School of Law |
| Janet H. Obrien | 1043850 | 1977 | Currently registered | Albany Law School | ||
| Jeannemarie O’Brien | 2693760 | 1995 | Currently registered | New York, NY | Wachtell, Lipton, Rosen & Katz | Fordham University School of Law |
| Jeffrey Robert O’Brien | 3994134 | 2001 | Currently registered | London, United Kingdom | Kynisca | Georgetown University Law Center |
| Jennifer Ann O’Brien | 4245734 | 2004 | Currently registered | Fordham University School of Law | ||
| Jennifer Marie O’Brien | 4486668 | 2007 | Currently registered | Manalapan, NJ | New York Law School | |
| Jennifer Michelle O’Brien | 4566311 | 2008 | Due to re‑register | Catholic University of America, Columbus School of Law | ||
| Jerome Francis O’Brien Jr | 4689626 | 2009 | Currently registered | Durham, NC | Cypress Creek Renewables, LLC | Georgetown University Law Center |
| Jerrold P. Obrien | 1092147 | 1973 | Delinquent | Jamesville, NY | Syracuse University College of Law | |
| Joan Susan Obrien | 1101039 | 1971 | Delinquent | Georgetown University Law Center | ||
| Joanne Mary O’Brien | 2796795 | 1997 | Currently registered | Quinnipiac University School of Law | ||
| John Augustine Obrien | 1245851 | 1968 | Currently registered | Bridgehampton, NY | Georgetown University Law Center | |
| John Charles O’Brien | 4753489 | 2009 | Currently registered | New York, NY | New York Presbyterian Hospital | Fordham University School of Law |
| John G. Obrien | 1830637 | 1982 | Currently registered | American University Washington College of Law | ||
| John Joseph O’Brien | 2712974 | 1995 | Currently registered | Philadelphia, PA | J.J. O’Brien & Associates, P.C. | New York University School of Law |
| John Michael O’Brien | 2312387 | 1990 | Currently registered | Sag Harbor, NY | John M. O’Brien Attorney at Law | St. John’s University School of Law |
| John Patrick O’Brien | 4753356 | 2009 | Currently registered | White Plains, NY | Berlandi Nussbaum & Reitzas LLP | University of Connecticut School of Law |
| John Patrick O’Brien | 5746433 | 2020 | Currently registered | Fordham University School of Law | ||
| John T. Obrien | 1653815 | 1980 | Resigned | Brooklyn Law School | ||
| John William O’Brien | 2907863 | 1998 | Currently registered | Red Bank, NJ | O’Brien Law Firm, LLC | Rutgers Law School |
| Jonathan Burns O’Brien | 5043369 | 2012 | Currently registered | New York, NY | Law Office of Jonathan O’Brien | Fordham University School of Law |
| Jonathan Francis Xavier O’Brien | 3036571 | 2000 | Currently registered | Boston, MA | Sherin and Lodgen LLP | Tulane University Law School |
| Jordan Michael O’Brien | 4398160 | 2006 | Resigned | St. John’s University School of Law | ||
| Joseph Francis O’Brien | 2966216 | 1999 | Currently registered | Scarsdale, NY | Village of Scarsdale - Assistant District Attorney | University at Buffalo School of Law (SUNY) |
| Joseph J. Obrien Jr | 2183226 | 1988 | Currently registered | Elisabeth Haub School of Law at Pace University | ||
| Joseph Matthew O’Brien | 5913348 | 2022 | Currently registered | New York, NY | King & Spalding LLP | Duke University School of Law |
| Kaitlin Elizabeth O’Brien | 5735386 | 2020 | Currently registered | Rochester, NY | Lippes Mathias LLP | Boston University School of Law |
| Kara Lynn O’Brien | 4024295 | 2002 | Currently registered | New York, NY | Practising Law Institute | George Washington University Law School |
| Karen Ann Obrien | 2197507 | 1988 | Currently registered | Fordham University School of Law | ||
| Karen Elizabeth O’Brien | 2983864 | 1999 | Resigned | Boston College Law School | ||
| Karen Joy O’Brien | 2950525 | 1999 | Currently registered | Hillsborough, NH | Boston University School of Law | |
| Karen Marie O’Brien | 2548345 | 1993 | Currently registered | New York, NY | Fine Olin & Anderman, P.C. | Villanova University Charles Widger School of Law |
| Karen Marra Obrien | 1901008 | 1984 | Currently registered | MC Henry, MD | Finseg | Syracuse University College of Law |
| Kate Marie O’Brien | 4348611 | 2005 | Currently registered | Catholic University of America, Columbus School of Law | ||
| Katherine Ann O’Brien | 2438984 | 1991 | Currently registered | Bronx, NY | Bronx Supreme Court | CUNY School of Law |
| Katherine Gail O’Brien | 4780227 | 2010 | Due to re‑register | Lincoln, NE | Nebraska Attorney General’s Office | Cornell Law School |
| Katherine J. O’Brien | 4152393 | 2003 | Currently registered | New Haven, CT | Yale New Haven Health Service | Elisabeth Haub School of Law at Pace University |
| Katherine North O’Brien | 5035407 | 2012 | Currently registered | Jersey City, NJ | Katherine O’Brien Law | Case Western Reserve University School of Law |
| Katherine R. Obrien | 1877687 | 1983 | Currently registered | Brooklyn Law School | ||
| Kathleen Lucey O’Brien | 5561246 | 2017 | Currently registered | New York, NY | PVH Corp. Tommy Hilfiger U.S.A., Inc. Division | Benjamin N. Cardozo School of Law, Yeshiva University |
| Kathleen Mary O’Brien | 5665419 | 2019 | Currently registered | Melville, NY | Law Office of Eileen Hopkins | Touro University Jacob D. Fuchsberg Law Center |
| Kathleen Mary O’Brien | 5806880 | 2020 | Currently registered | Jersey City, NJ | Kuehne + Nagel Inc. | Roger Williams University School of Law |
| Kathryn Danielle O’Brien | 6038418 | 2023 | Currently registered | Brooklyn, NY | The Legal Aid Society | St. John’s University School of Law |
| Kathyleen A. Obrien | 1650068 | 1979 | Currently registered | Los Angeles, CA | Georgetown University Law Center | |
| Kayla Michelle Obrien | 6308944 | 2026 | Currently registered | New York, NY | Allen Overy Shearman and Sterling LLP | Emory University School of Law |
| Kaylyn Renae O’Brien | 6152284 | 2024 | Currently registered | Canton, NY | Thomas & O’Brien Law Office, PLLC | Vermont Law and Graduate School |
| Keith D. O’Brien | 6184212 | 2025 | Currently registered | Maurice A. Deane School of Law at Hofstra University | ||
| Kelli Marie O’Brien | 2673804 | 1995 | Currently registered | Goshen, NY | Kelli M. O’Brien, Esq. | Albany Law School |
| Kelly Ann O’Brien | 4911681 | 2011 | Currently registered | Meriden, CT | Law Office of Leslie A. Aldrich | Quinnipiac University School of Law |
| Kelly Ann O’Brien | 5110630 | 2013 | Currently registered | Buffalo, NY | M &T Bank | University at Buffalo School of Law (SUNY) |
| Kelly Lynn O’Brien | 4811501 | 2010 | Currently registered | Stamford, CT | Clerk’s Office- JD of Stamford/Norwalk | Touro University Jacob D. Fuchsberg Law Center |
| Kelsey Linda O’Brien | 5305933 | 2015 | Currently registered | Great Neck, NY | Shaub, Ahmuty, Citrin & Spratt, LLP | Albany Law School |
| Kenneth A. O’Brien Jr | 1705599 | 1981 | Currently registered | Los Angeles, CA | Sheppard, Mullin, Richter & Hampton, LLP | Columbia Law School |
| Kevin Eugene O’Brien | 2219954 | 1988 | Due to re‑register | Wilton, CT | Fordham University School of Law | |
| Kevin J. O’Brien | 1673847 | 1980 | Currently registered | New York, NY | Ford O’Brien Landy LLP | Harvard Law School |
| Kevin J. O’Brien | 1979335 | 1985 | Currently registered | East Williston, NY | O’Brien Law, P.C. | St. John’s University School of Law |
| Kevin J. O’Brien | 2372563 | 1991 | Currently registered | Heuvelton, NY | Kevin J. O’Brien, Esq. | University at Buffalo School of Law (SUNY) |
| Kevin John O’Brien | 4267928 | 2005 | Currently registered | Philadelphia, PA | Marks O’Neill O’Brien, Doherty & Kelly P.C. | Seton Hall University School of Law |
| Kevin Jordan O’Brien | 5983713 | 2022 | Currently registered | New York, NY | King & Spalding LLP | Boston College Law School |
| Kevin Kelly O’Brien | 4372223 | 2006 | Currently registered | Albany, NY | O’Brien & Eggleston, PLLC | Albany Law School |
| Kevin L. O’Brien | 2249431 | 1989 | Currently registered | Albany Law School | ||
| Kevin Michael O’Brien | 6014351 | 2023 | Currently registered | Radnor, PA | Nicolson Law Group | St. Thomas University Benjamin L. Crump College of Law (Florida) |
| Kevin Thomas Obrien | 1247600 | 1978 | Currently registered | New York University School of Law | ||
| Kevin Thomas Obrien | 1938505 | 1984 | Currently registered | Boston College Law School | ||
| Kevin Thomas O’Brien | 3038478 | 2000 | Due to re‑register | Williamsville, NY | The Law Office of Kevin T. O’Brien | Brooklyn Law School |
| Kimberly Ann O’Brien | 2386761 | 1991 | Currently registered | Menands, NY | Nys Department of Health Bureau of Adjudication | American University Washington College of Law |
| Kinsey Anne O’Brien | 5189576 | 2014 | Currently registered | Buffalo, NY | Hodgson Russ LLP | University at Buffalo School of Law (SUNY) |
| Kristie Noel O’Brien | 4888889 | 2011 | Suspended, delinquent | Bond University Faculty of Law | ||
| Kristin Neilson O’Brien | 4417630 | 2006 | Delinquent | Emory University School of Law | ||
| Lana O’Brien | 4413720 | 2006 | Due to re‑register | New York, NY | Sony Corporation of America | New York University School of Law |
| Lauren O’Brien | 5969696 | 2022 | Currently registered | New York, NY | New York City Law Department | Harvard Law School |
| Lawrence Francis Obrien | 1620517 | 1973 | Delinquent | Columbia Law School | ||
| Lawrence John O’Brien | 5640420 | 2018 | Due to re‑register | Wilmington, DE | McCarter & English, LLP | George Washington University Law School |
| Leslie Ann O’Brien | 4590006 | 2008 | Resigned | New York University School of Law | ||
| Liam O’Brien | 2472512 | 1992 | Due to re‑register | New York, NY | McCormick & O’Brien LLP | Fordham University School of Law |
| Lindsey Kennedy O’Brien | 6199558 | 2025 | Currently registered | New York, NY | Proskauer Rose LLP | University of Florida Levin College of Law |
| Lisa Marie O’Brien | 2613818 | 1994 | Currently registered | Georgetown University Law Center | ||
| Lori May O’Brien | 4505277 | 2007 | Currently registered | Rochester, NY | Legal Assistance of Western NY, Inc | Brooklyn Law School |
| Lui Patrick O’Brien | 6340962 | 2026 | Currently registered | Trinity College Dublin School of Law | ||
| Luke J. O’Brien | 5490263 | 2017 | Currently registered | Newark, NJ | Calcagni & Kanefsky LLP | Yale Law School |
| Maeve Catherine O’Brien | 6193122 | 2025 | Currently registered | New York, NY | Paul, Weiss, Rifkind, Wharton & Garrison | New York University School of Law |
| Margaret Alyce O’Brien | 5923933 | 2022 | Currently registered | Washington, DC | Willkie Farr & Gallagher LLP | George Washington University Law School |
| Margaret Attwood O’Brien | 2741692 | 1996 | Resigned | New York Law School | ||
| Margaret B. Obrien | 1506617 | 1979 | Currently registered | New York Law School | ||
| Margaret Irene O’Brien | 4090478 | 2002 | Currently registered | New York, NY | Zimmet Law Group, P.C. | Santa Clara University School of Law |
| Margaret Jane O’Brien | 2918050 | 1999 | Currently registered | Woodland Hills, CA | The Liberty Company Insurance Brokers | Fordham University School of Law |
| Margaret Mary O’Brien | 2097038 | 1987 | Currently registered | Fordham University School of Law | ||
| Margaret Mary O’Brien | 2107522 | 1987 | Currently registered | New York, NY | Marsh & McLennan Companies | Fordham University School of Law |
| Marguerite Agnes O’Brien | 5694245 | 2019 | Currently registered | Wilmington, DE | Ross Aronstam & Moritz LLP | Vanderbilt University Law School |
| Marie J. O’Brien | 4648127 | 2009 | Currently registered | New York, NY | Abrams Garfinkel Margolis Bergson, LLP | Western New England University School of Law |
| Marie Helene O’Brien | 6269534 | 2025 | Currently registered | Fordham University School of Law | ||
| Mary Ellen Eileen Obrien | 3015294 | 2000 | Currently registered | Saratoga Springs, NY | Mary Ellen O’Brien, Esq. | St. John’s University School of Law |
| Matthew Emmett O’Brien | 4052064 | 2002 | Due to re‑register | Brooklyn, NY | Matthew E. O’Brien, Esq. | Georgetown University Law Center |
| Matthew Patrick O’Brien | 5863352 | 2021 | Delinquent | New York, NY | Nelson Mullins Riley & Scarborough LLP | Fordham University School of Law |
| Maureen Ann O’Brien | 2711059 | 1995 | Currently registered | Fordham University School of Law | ||
| Maureen Ann O’Brien | 2774032 | 1996 | Due to re‑register | Manahawkin, NJ | Ajian and Montgomery | Seton Hall University School of Law |
| Maureen E. Obrien | 1714005 | 1981 | Currently registered | New York Law School | ||
| Megan Elizabeth O’Brien | 4748505 | 2009 | Currently registered | Latham, NY | New York State United Teachers | Western New England University School of Law |
| Meghan Callagee O’Brien | 5388244 | 2015 | Suspended, delinquent | New York, NY | New York County District Attorney’s Office | Brooklyn Law School |
| Merrill M. Obrien | 2409043 | 1981 | Currently registered | Montclair, NJ | Obrien Thornton, LLC | Rutgers Law School |
| Michael C. O’Brien | 2988301 | 1999 | Resigned | Boston College Law School | ||
| Michael Dean O’Brien | 5758511 | 2020 | Currently registered | Rochester, NY | Duke Law Firm, P.C. | Penn State Dickinson Law |
| Michael Dennis O’Brien | 2463099 | 1992 | Due to re‑register | Warwick, NY | Michael O’Brien, Esq. | Benjamin N. Cardozo School of Law, Yeshiva University |
| Michael Edward O’Brien | 2934792 | 1999 | Currently registered | New York, NY | Seward & Kissel LLP | Harvard Law School |
| Michael Francis Obrien | 1112036 | 1976 | Currently registered | Albany, NY | Albany Law School | |
| Michael J. O’Brien | 2321743 | 1990 | Delinquent | North Wildwood, NJ | Candlelight Inn | Rutgers Law School |
| Michael Jeremiah O’Brien | 2318707 | 1990 | Due to re‑register | Boston University School of Law | ||
| Michael John Obrien | 1717180 | 1981 | Currently registered | New York, NY | Bochner PLLC | Harvard Law School |
| Michael Joseph Obrien | 1763606 | 1982 | Currently registered | University at Buffalo School of Law (SUNY) | ||
| Michael Joseph O’Brien | 2270015 | 1989 | Currently registered | Fordham University School of Law | ||
| Michael Joseph O’Brien | 3056892 | 2000 | Currently registered | Rensselaer, NY | N.Y.S. Office of Children & Family Services Capital View Office Park | Western New England University School of Law |
| Michael P. O’Brien | 3993003 | 2001 | Currently registered | Raritan, NJ | Sebco Laundry Systems, Inc. | Quinnipiac University School of Law |
| Michael Patrick O’Brien | 2970986 | 1999 | Currently registered | Chicago, IL | Sheppard Mullin | Northwestern University Pritzker School of Law |
| Michael Paul O’Brien | 4118642 | 2003 | Currently registered | New York, NY | O’Brien Law Firm, PLLC | Suffolk University Law School |
| Michael Peter Obrien | 1270511 | 1975 | Due to re‑register | Cornell Law School | ||
| Michelle Mary O’Brien | 5053376 | 2012 | Currently registered | Bernardsville, NJ | Flanagan, Barone & O’Brien, LLC | Seton Hall University School of Law |
| Michelle Renee O’Brien | 5346374 | 2015 | Currently registered | Scranton, PA | The O’Brien Law Group LLC | University of Maryland Francis King Carey School of Law |
| Monica Mary O’Brien | 2619948 | 1994 | Currently registered | Port Washington, NY | Monica M Obrien, Atty at Law | New York Law School |
| Monica R. O’Brien | 4361333 | 2006 | Currently registered | Rochester, NY | Monroe County | University of Akron School of Law |
| Moreen Ann O’Brien | 5036843 | 2012 | Currently registered | Bruxelles, Belgium | European Commission | Cornell Law School |
| Nancy E. O’Brien | 2907889 | 1998 | Disbarred | Maurice A. Deane School of Law at Hofstra University | ||
| Nicholas M. O’Brien | 5748082 | 2019 | Currently registered | New York, NY | Baker McKenzie LLP | New York University School of Law |
| Noel Patrick O’Brien | 5925722 | 2022 | Due to re‑register | White Plains, NY | Cabanillas & Associates, P.C. | University College Cork School of Law |
| Nolan Edward O’Brien | 5908355 | 2022 | Currently registered | Hempstead, NY | Town of Hempstead Town Attorney’s Office | St. John’s University School of Law |
| Padrickelly Joseph Obrien | 1880467 | 1983 | Resigned | University of Florida Levin College of Law | ||
| Patric Russell O’Brien | 4010930 | 2002 | Currently registered | Waltham, MA | National Grid | New England Law Boston |
| Patricia Ann O’Brien | 2551596 | 1993 | Suspended, delinquent | Deer Park, NY | Touro University Jacob D. Fuchsberg Law Center | |
| Patricia Elizabeth O’Brien | 2835650 | 1997 | Currently registered | New York, NY | Berkley Professional Liability, LLC | St. John’s University School of Law |
| Patrick O’Brien | 5077052 | 2012 | Currently registered | Boston, MA | Boston University School of Law | |
| Patrick A. O’Brien | 1509629 | 1977 | Currently registered | Long Island City, NY | Patrick A. O’Brien | St. John’s University School of Law |
| Patrick Bradley O’Brien | 4334645 | 2005 | Currently registered | New York, NY | Jones Day | New York University School of Law |
| Patrick J. Obrien | 2912293 | 1998 | Due to re‑register | New York, NY | Becker Glynn Muffly Chassin & Hosinski LLP | Columbia Law School |
| Patrick Joseph Obrien | 1373638 | 1975 | Delinquent | St. John’s University School of Law | ||
| Patrick Joseph O’Brien Jr. | 5604939 | 2018 | Currently registered | Albany, NY | Public Utility Law Project of New York | University at Buffalo School of Law (SUNY) |
| Paul D. Obrien | 1968262 | 1985 | Delinquent | St. John’s University School of Law | ||
| Paul Edward Obrien | 2188316 | 1988 | Due to re‑register | Doylestown, PA | Georgetown University Law Center | |
| Paul Edward O’Brien | 2870723 | 1998 | Currently registered | Washington, DC | Meta Platforms | Georgetown University Law Center |
| Paul Jospeh O’Brien | 6186118 | 2024 | Currently registered | Albany, NY | New York State Department of Financial Services | University of Akron School of Law |
| Paul Michael O’Brien | 5424544 | 2016 | Currently registered | Bay Shore, NY | O’Brien PLLC | Brooklyn Law School |
| Paul Vincent O’Brien | 2854040 | 1997 | Currently registered | Garden City, NY | Phillips Lytle LLP | Fordham University School of Law |
| Paula Jean O’Brien | 4384251 | 2006 | Due to re‑register | Albany, NY | Nys Division of Human Rights | Albany Law School |
| Peter K. O’Brien | 2503332 | 1992 | Currently registered | New York, NY | Hunton Andrewskurth LLP | |
| Raymond Daniel O’Brien III | 5288071 | 2014 | Suspended, currently registered | New York, NY | U.S. Dept. of Housing and Urban Development | Rutgers Law School |
| Raymond F. Obrien | 1781079 | 1982 | Currently registered | Staten Island, NY | O’Brien | Fordham University School of Law |
| Rebecca O’Brien | 5539200 | 2017 | Currently registered | Washington, DC | Sidley Austin LLP | Fordham University School of Law |
| Rebecca Caitlin O’Brien | 4467635 | 2007 | Resigned | University of California, Berkeley, School of Law | ||
| Richard E. O’Brien | 2248458 | 1989 | Currently registered | Seton Hall University School of Law | ||
| Richard Edward Obrien | 1880343 | 1983 | Currently registered | Philadelphia, PA | ||
| Richard Patrick O’Brien | 4675641 | 2009 | Currently registered | Fordham University School of Law | ||
| Richard Stever O’Brien | 4023859 | 2002 | Resigned | Catholic University of America, Columbus School of Law | ||
| Richard Thomas O’Brien | 4370706 | 2006 | Currently registered | Garden City, NY | Farber, Brocks & Zane, LLP. | St. John’s University School of Law |
| Riley Patrick O’Brien | 6269898 | 2026 | Currently registered | Boston, MA | Sidley Austin LLP | University of British Columbia Peter A. Allard School of Law |
| Robert Michael Obrien | 1602390 | 1973 | Delinquent | New York, NY | St. John’s University School of Law | |
| Robert Patrick O’Brien | 2176246 | 1988 | Due to re‑register | Garden City, NY | Mahon, Mahon, Kerins & O’Brien LLC | St. John’s University School of Law |
| Robert W. O’Brien | 1436880 | 1979 | Currently registered | Valley Stream, NY | Robert W. O’Brien Esq. | St. John’s University School of Law |
| Sally Ann O’Brien | 4967501 | 2011 | Currently registered | Laconia, NH | New Hampshire Ball Bearings, Inc. | University of New Hampshire Franklin Pierce School of Law |
| Sara Lynn O’Brien | 4693263 | 2009 | Currently registered | Harrison, NY | Bonafide Health, LLC | University of Connecticut School of Law |
| Sarah A. O’Brien | 5480728 | 2017 | Currently registered | Buffalo, NY | Barclay Damon LLP | University at Buffalo School of Law (SUNY) |
| Scott Macdonnell O’Brien | 5551262 | 2017 | Currently registered | New York, NY | Alston & Bird LLP | Duke University School of Law |
| Sean Douglas O’Brien | 2320620 | 1990 | Currently registered | Schenectady, NY | City of Schenectady | University of Wisconsin Law School |
| Sean K. O’Brien | 3003910 | 1999 | Suspended, delinquent | American University Washington College of Law | ||
| Sean Michael O’Brien | 4725933 | 2009 | Currently registered | New York, NY | New York City Housing Authority | Roger Williams University School of Law |
| Sean Michael O’Brien | 5198510 | 2014 | Currently registered | Buffalo, NY | Lippes Mathias LLP | University at Buffalo School of Law (SUNY) |
| Sean Reynolds O’Brien | 2703403 | 1995 | Currently registered | New York, NY | O’Brien LLP | New York University School of Law |
| Seton Hartnett O’Brien | 5727565 | 2019 | Currently registered | New York, NY | Gibson, Dunn & Crutcher | Harvard Law School |
| Shannon Casey O’Brien | 5330998 | 2015 | Currently registered | Boston, MA | Charlesbank Capital Partners | Georgetown University Law Center |
| Shannon Duignan O’Brien | 5951595 | 2022 | Due to re‑register | Garden City South, NY | Mahon, Mahon, Kerins & O’Brien, LLC | St. John’s University School of Law |
| Sharon Kelly O’Brien | 2280170 | 1989 | Currently registered | Seton Hall University School of Law | ||
| Shaun Christopher O’Brien | 2784296 | 1997 | Currently registered | Washington, DC | Afscme | Cornell Law School |
| Siobhan B. O’Brien | 5768791 | 2020 | Currently registered | New York, NY | NYC Department of Education | Elisabeth Haub School of Law at Pace University |
| Stephanie Marie O’Brien | 4531588 | 2007 | Suspended, delinquent | University of Arkansas School of Law | ||
| Stephen Lee O’Brien | 2027381 | 1986 | Currently registered | Nesconset, NY | O’Brien & O’Brien LLP Law Offices | |
| Stephen Shields O’Brien | 2317782 | 1990 | Currently registered | Fordham University School of Law | ||
| Stephen X. Obrien | 1791557 | 1982 | Due to re‑register | Rochester, NY | Saint Louis University School of Law | |
| Steven P O’Brien | 4434361 | 2006 | Currently registered | San Francisco, CA | Autofi, Inc. | University of Pennsylvania Carey Law School |
| Stewart D. Obrien | 1299064 | 1978 | Delinquent | University at Buffalo School of Law (SUNY) | ||
| Tama O’Brien | 4331393 | 2005 | Currently registered | University of Florida Levin College of Law | ||
| Tara A. Obrien | 2012706 | 1985 | Currently registered | Fordham University School of Law | ||
| Taryen R. O’Brien | 4137568 | 2003 | Currently registered | Brooklyn, NY | Office of the District Attorney Kings County | St. John’s University School of Law |
| Terence Gerard O’Brien | 2714798 | 1996 | Due to re‑register | New York, NY | White & Case LLP | St. John’s University School of Law |
| Thomas Carey Obrien | 1232941 | 1974 | Suspended, delinquent | Colorado Springs, CO | Mattox & Obrien PC | Albany Law School |
| Thomas Carroll Obrien | 1285659 | 1973 | Delinquent | Corning, NY | Thomas C. O’Brien | Cornell Law School |
| Thomas D. O’Brien | 4154688 | 2003 | Currently registered | Palo Alto, CA | Owner, Inc | Columbia Law School |
| Thomas Edwin O’Brien | 2302792 | 1989 | Delinquent | Seton Hall University School of Law | ||
| Thomas Francis Obrien | 1316389 | 1978 | Due to re‑register | Clinton, NY | O’Brien Law Office | Syracuse University College of Law |
| Thomas Francis O’Brien III | 5304977 | 2015 | Currently registered | Clinton, NY | O’Brien Law Office | Albany Law School |
| Thomas G. Obrien | 1154210 | 1967 | Currently registered | Yale Law School | ||
| Thomas G. O’Brien | 5189147 | 2014 | Currently registered | New York, NY | Arkin Solbakken LLP | Brooklyn Law School |
| Thomas Lawrence Obrien | 1830355 | 1982 | Suspended, delinquent | New York, NY | Obrien & Obrien | |
| Thomas M. O’Brien | 1789312 | 1982 | Currently registered | New York, NY | The Legal Aid Society | Georgetown University Law Center |
| Thomas Rogers O’Brien | 2032449 | 1985 | Currently registered | Seton Hall University School of Law | ||
| Tim A. O’Brien | 4104535 | 2003 | Delinquent | Washington, DC | Tik Tok, Inc. | Georgetown University Law Center |
| Timothy Andrew O’Brien | 2721280 | 1996 | Currently registered | Ossining, NY | Fordham University School of Law | |
| Timothy Andrew O’Brien | 5073812 | 2012 | Currently registered | New York, NY | Cantor Fitzgerald | Benjamin N. Cardozo School of Law, Yeshiva University |
| Timothy J. Obrien | 1624485 | 1977 | Due to re‑register | Seoul, South Korea | Dentons Lee | Harvard Law School |
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026.