William B. Brentani
On the New York attorney register since 1990 · office in San Francisco, CA
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 2328771
- Admitted
- 1990 · First Department
- Status
- Currently registered
- Next registration
- Aug 2028
William B. Brentani is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1990 in the First Department, with an office in San Francisco, CA; next registration due Aug 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 William B. Brentani has filed the biennial registration the court system requires; the next one is due in Aug 2028.
- Currently registered unchanged
- Due to re‑register to Currently registered the routine two-year cycle: the registration window closed with a filing
- Due to re‑register 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
1,307 other attorneys list Simpson Thacher & Bartlett LLP or one of its other names as their employer on the register; 49 of them were admitted before 1990. The 5 whose admission is closest to 1990, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Patrick Joseph Ryan | 1990 | Currently registered |
| Steven C. Stickler | 1990 | Due to re‑register |
| Michael Ocken Wolfson | 1990 | Currently registered |
| Michael William Wolitzer | 1990 | Currently registered |
| Jeffrey Weston Cohen | 1991 | Currently registered |
All 1,308 registrations that list Simpson Thacher & Bartlett 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
William B. Brentani studied at Boston University School of Law (the register spells it “BOSTON UNIVERSITY”). 1,308 of its 6,362 living graduates on the register were admitted in the 1990s, as William B. Brentani was.
- Same law school
- 6,362living graduates; 86.6% registered (current or due), against 87.1% overall
- Office in San Francisco, CA
- 2,474living registrants (outside New York State)
Of the 2,474 living registrants with an office in San Francisco, CA, 204 were admitted before 1990 and 2,255 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 Simpson Thacher & Bartlett LLP1,308 on the register, 49 of the others admitted before 1990.
- Boston University School of Law graduates on the register6,362 living, 86.6% registered.
- New York-admitted attorneys in San Francisco, CA2,474 living registrants give an office there.
- Admitted in 19906,112 people admitted in 1990 are on the register, 2,199 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 William B. Brentani’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 William B. Brentani in 1990. 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).