Sebastien Charles Pierre Marie Deligne
On the New York attorney register since 2026 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 6298939
- Admitted
- 2026 · Third Department
- Status
- Currently registered
- Next registration
- Jul 2028
Sebastien Charles Pierre Marie Deligne is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2026 in the Third Department, with an office in New York, NY. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means Sebastien Charles Pierre Marie Deligne has filed the biennial registration the court system requires; the next one is due in Jul 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
491 other attorneys list Mayer Brown LLP or one of its other names as their employer on the register; 474 of them were admitted before 2026, and 305 of the 492 give an office in New York, NY. The 5 whose admission is closest to 2026, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Marissa Nicole Cascio | 2026 | Currently registered |
| Caitlyn A Coffey | 2026 | Currently registered |
| Kyle Rae Suba Crawford | 2026 | Currently registered |
| Maximilian Hubertus Hechl | 2026 | Currently registered |
| Abigail Hoover | 2026 | 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
Sebastien Charles Pierre Marie Deligne studied at Columbia Law School. 3,116 of its 18,953 living graduates on the register were admitted in the 2020s, as Sebastien Charles Pierre Marie Deligne was.
- Same law school
- 18,953living graduates; 87.4% registered (current or due), against 87.1% overall
- Office in New York, NY
- 93,604living registrants
Of the 93,604 living registrants with an office in New York, NY, 91,608 were admitted before 2026 and 0 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 Mayer Brown LLP492 on the register, 474 of the others admitted before 2026; 305 of the 492 give an office in New York, NY.
- Columbia Law School graduates on the register18,953 living, 87.4% registered.
- Attorneys with an office in New York, NY93,604 living registrants give an office there.
- New York County’s registered bar75,989 currently registered, 46.63 per 1,000 residents.
- Admitted in 20266,220 people admitted in 2026 are on the register, 3,119 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 Sebastien Charles Pierre Marie Deligne’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 Sebastien Charles Pierre Marie Deligne in 2026. A complaint about this attorney would go to the First Department’s grievance committee, which covers New York 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).