Mark Byrne Rosen
On the New York attorney register since 2008 · office in Portsmouth, NH
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 4624805
- Admitted
- 2008 · First Department
- Status
- Currently registered
- Next registration
- Mar 2028
Mark Byrne Rosen is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2008 in the First Department, with an office in Portsmouth, NH; 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 Mark Byrne Rosen 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
22 other attorneys list Pierce Atwood LLP or one of its other names as their employer on the register; 11 of them were admitted before 2008, and 2 of the 23 give an office in Portsmouth, NH. The 5 whose admission is closest to 2008, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Jeffrey Ernest Francis | 2006 | Currently registered |
| Emily Laura Cooke | 2007 | Currently registered |
| Nolan Ladislav Reichl | 2007 | Currently registered |
| Melanie Anne Conroy | 2009 | Currently registered |
| Andrew Owen Kaplan | 2010 | 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
Mark Byrne Rosen studied at Benjamin N. Cardozo School of Law, Yeshiva University (the register spells it “Yeshiva University Cardozo School of Law”). 2,933 of its 12,878 living graduates on the register were admitted in the 2000s, as Mark Byrne Rosen was.
- Same law school
- 12,878living graduates; 88.9% registered (current or due), against 87.1% overall
- Office in Portsmouth, NH
- 38living registrants (outside New York State)
Of the 38 living registrants with an office in Portsmouth, NH, 27 were admitted before 2008 and 9 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 Pierce Atwood LLP23 on the register, 11 of the others admitted before 2008; 2 of the 23 give an office in Portsmouth, NH.
- Benjamin N. Cardozo School of Law, Yeshiva University graduates on the register12,878 living, 88.9% registered.
- New York-admitted attorneys in Portsmouth, NH38 living registrants give an office there.
- Admitted in 20089,683 people admitted in 2008 are on the register, 3,620 of them through the First 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 Mark Byrne Rosen’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, First Department, which admitted Mark Byrne Rosen in 2008. The register places the office outside New York, so a complaint would go to that department’s grievance committee (22 NYCRR 1240.7(a)(2)).
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).