Mark D. Nielsen
On the New York attorney register since 2019 · office in Stamford, CT
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5647615
- Admitted
- 2019 · First Department
- Status
- Currently registered
- Next registration
- Aug 2027
Mark D. Nielsen is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2019 in the First Department, with an office in Stamford, CT; next registration due Aug 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 D. Nielsen has filed the biennial registration the court system requires; the next one is due in Aug 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
134 other attorneys list Day Pitney LLP or one of its other names as their employer on the register; 92 of them were admitted before 2019, and 21 of the 135 give an office in Stamford, CT. The 5 whose admission is closest to 2019, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Namrata Sambasivarao Alla | 2019 | Currently registered |
| Amberly Nicole Antebi | 2019 | Currently registered |
| Carly Clinton | 2019 | Currently registered |
| Michael Lawrence Fialkoff | 2019 | Currently registered |
| Katherine Ann McAllister | 2019 | 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 D. Nielsen studied at Harvard Law School. 3,482 of its 14,378 living graduates on the register were admitted in the 2010s, as Mark D. Nielsen was.
- Same law school
- 14,378living graduates; 86.1% registered (current or due), against 87.1% overall
- Office in Stamford, CT
- 1,146living registrants (outside New York State)
Of the 1,146 living registrants with an office in Stamford, CT, 1,037 were admitted before 2019 and 84 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 Day Pitney LLP135 on the register, 92 of the others admitted before 2019; 21 of the 135 give an office in Stamford, CT.
- Harvard Law School graduates on the register14,378 living, 86.1% registered.
- New York-admitted attorneys in Stamford, CT1,146 living registrants give an office there.
- Admitted in 20198,536 people admitted in 2019 are on the register, 2,652 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 D. Nielsen’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 D. Nielsen in 2019. 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).