Dennis Patrick O’Brien
On the New York attorney register since 2004 · office in Westbury, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 4210100
- Admitted
- 2004 · Second Department
- Status
- Currently registered
- Next registration
- Mar 2028
Dennis Patrick O’Brien is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2004 in the Second Department, with an office in Westbury, NY; next registration due Mar 2028. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means Dennis Patrick O’Brien has filed the biennial registration the court system requires; the next one is due in Mar 2028.
- Currently registered unchanged
- Currently registered unchanged
- Currently registered the first file we hold
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; the Jul 3, 2026 and Aug 6, 2026 files for the history.
Others who list this employer on the register
9 other attorneys list Frazer & Feldman, LLP or one of its other names as their employer on the register; 6 of them were admitted before 2004, and all 10 give an office in Westbury, NY. The 5 whose admission is closest to 2004, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Joseph Patrick Lilly | 1993 | Currently registered |
| James H. Pyun | 1993 | Currently registered |
| Laura A. Ferrugiari | 1995 | Currently registered |
| Genevieve E. Peeples | 2009 | Currently registered |
| Daniel Howard Levin | 2013 | Currently registered |
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; employer spellings merged (methodology).
Where this record sits on the register
Dennis Patrick O’Brien studied at Brooklyn Law School (the register spells it “BROOKLYN”). 4,028 of its 20,058 living graduates on the register were admitted in the 2000s, as Dennis Patrick O’Brien was.
- Same law school
- 20,058living graduates; 86.6% registered (current or due), against 87.1% overall
- Office in Westbury, NY
- 343living registrants
Of the 343 living registrants with an office in Westbury, NY, 224 were admitted before 2004 and 111 after.
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; living registrants only.
Questions this record leads to
- Everyone who lists Frazer & Feldman, LLP10 on the register, 6 of the others admitted before 2004; all 10 give an office in Westbury, NY.
- Brooklyn Law School graduates on the register20,058 living, 86.6% registered.
- Attorneys with an office in Westbury, NY343 living registrants give an office there.
- Nassau County’s registered bar9,622 currently registered, 6.92 per 1,000 residents.
- Admitted in 20048,407 people admitted in 2004 are on the register, 2,421 of them through the Second Department.
- Every registration that reads “Currently registered”286,911 on the register file of Sep 29, 2026, by decade of admission.
- What a New York lawyer may chargeThe court rules on fees, retainers and fee disputes, each cited.
How to confirm it officially
For a statement of Dennis Patrick O’Brien’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Second Department, which admitted Dennis Patrick O’Brien in 2004. A complaint about this attorney would go to the Second Department’s Grievance Committee for the Tenth Judicial District, which covers Nassau County, where the register places the office.
This page reads the register file of Sep 29, 2026, and the court system’s own search can be newer; the register shows only the current value, so a suspension that ended before the files we hold, or a censure, leaves no trace here (Appellate Division decisions are published through the court system’s Law Reporting Bureau).