Brennan Keith Halloran
On the New York attorney register since 2019 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5645627
- Admitted
- 2019 · First Department
- Status
- Currently registered
- Next registration
- Dec 2027
Brennan Keith Halloran 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 New York, NY; next registration due Dec 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 Brennan Keith Halloran has filed the biennial registration the court system requires; the next one is due in Dec 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
893 other attorneys list Gibson, Dunn & Crutcher LLP or one of its other names as their employer on the register; 498 of them were admitted before 2019, and 613 of the 894 give an office in New York, NY. The 5 whose admission is closest to 2019, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Jonathan Jeffrey Abrams | 2019 | Currently registered |
| Abdullah Fahad Albawardy | 2019 | Currently registered |
| Nadia Kathryn Alhadi | 2019 | Currently registered |
| Yehuda Aryeh Auman | 2019 | Currently registered |
| Raquel Elizabeth Babb | 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
Brennan Keith Halloran studied at Harvard Law School. 3,482 of its 14,378 living graduates on the register were admitted in the 2010s, as Brennan Keith Halloran was.
- Same law school
- 14,378living graduates; 86.1% 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, 70,234 were admitted before 2019 and 20,695 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 Gibson, Dunn & Crutcher LLP894 on the register, 498 of the others admitted before 2019; 613 of the 894 give an office in New York, NY.
- Harvard Law School graduates on the register14,378 living, 86.1% registered; 107 of them list Gibson, Dunn & Crutcher LLP.
- 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 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 Brennan Keith Halloran’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 Brennan Keith Halloran in 2019. 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).