Mark Christopher Nielsen
On the New York attorney register since 1997 · office in Washington, DC
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 2821957
- Admitted
- 1997 · Third Department
- Status
- Currently registered
- Next registration
- Jun 2027
Mark Christopher Nielsen is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1997 in the Third Department, with an office in Washington, DC; next registration due Jun 2027. 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 Christopher Nielsen has filed the biennial registration the court system requires; the next one is due in Jun 2027.
- 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
The register gives this attorney’s employer as “Groom Law Group, Chartered”. We count that spelling with Groom Law Group, the name most registrants give for the firm now; the register does not say where the attorney works today.
23 other attorneys list Groom Law Group or one of its other names as their employer on the register; 7 of them were admitted before 1997, and all 24 give an office in Washington, DC. The 5 whose admission is closest to 1997, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Barry Evan Warner | 1994 | Due to re‑register |
| James Vincent Cole | 1996 | Due to re‑register |
| Christine Louise Keller | 1996 | Due to re‑register |
| David Nathaniel Levine | 1998 | Due to re‑register |
| Malcolm Christopher Slee | 1999 | 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 Christopher Nielsen studied at University at Buffalo School of Law (SUNY) (the register spells it “SUNY AT BUFFALO”). 1,970 of its 9,828 living graduates on the register were admitted in the 1990s, as Mark Christopher Nielsen was.
- Same law school
- 9,828living graduates; 90.9% registered (current or due), against 87.1% overall
- Office in Washington, DC
- 12,527living registrants (outside New York State)
Of the 12,527 living registrants with an office in Washington, DC, 2,090 were admitted before 1997 and 10,211 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 Groom Law Group24 on the register, 7 of the others admitted before 1997; all 24 give an office in Washington, DC.
- University at Buffalo School of Law (SUNY) graduates on the register9,828 living, 90.9% registered.
- New York-admitted attorneys in Washington, DC12,527 living registrants give an office there.
- Admitted in 19977,066 people admitted in 1997 are on the register, 1,696 of them through the Third 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 Christopher Nielsen’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Third Department, which admitted Mark Christopher Nielsen in 1997. 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).