Sean Adam Petterson
On the New York attorney register since 2016 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5412663
- Admitted
- 2016 · First Department
- Status
- Currently registered
- Next registration
- Sep 2028
Sean Adam Petterson is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2016 in the First Department, with an office in New York, NY; next registration due Sep 2028. Since Jul 3, 2026 it has moved only through the routine two-year cycle.
What this status means on the register
On the register, “Currently registered” means Sean Adam Petterson has filed the biennial registration the court system requires; the next one is due in Sep 2028.
- Due to re‑register to Currently registered the routine two-year cycle: the registration window closed with a filing
- Currently registered to Due to re‑register the routine two-year cycle: the registration window opened
- 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
44 other attorneys list Lieff Cabraser Heimann & Bernstein LLP or one of its other names as their employer on the register; 28 of them were admitted before 2016, and 33 of the 45 give an office in New York, NY. The 5 whose admission is closest to 2016, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Lucas Estlund Issacharoff | 2015 | Currently registered |
| Avery Scott Halfon | 2016 | Currently registered |
| Katherine Irene McBride | 2016 | Due to re‑register |
| Patrick Ian Andrews | 2017 | Currently registered |
| Rebecca Pearl Chang | 2017 | Currently registered |
All 45 registrations that list Lieff Cabraser Heimann & Bernstein LLP
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
Sean Adam Petterson studied at New York University School of Law. 5,283 of its 23,248 living graduates on the register were admitted in the 2010s, as Sean Adam Petterson was.
- Same law school
- 23,248living graduates; 86.5% 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, 62,568 were admitted before 2016 and 28,586 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 Lieff Cabraser Heimann & Bernstein LLP45 on the register, 28 of the others admitted before 2016; 33 of the 45 give an office in New York, NY.
- New York University School of Law graduates on the register23,248 living, 86.5% 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 20168,420 people admitted in 2016 are on the register, 2,373 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 Sean Adam Petterson’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 Sean Adam Petterson in 2016. 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).