Aideen Madeleine Jeanne Brennan
On the New York attorney register since 2023 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 6055909
- Admitted
- 2023 · First Department
- Status
- Currently registered
- Next registration
- Nov 2027
Aideen Madeleine Jeanne Brennan is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2023 in the First 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 Aideen Madeleine Jeanne Brennan has filed the biennial registration the court system requires; the next one is due in Nov 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
491 other attorneys list Mayer Brown LLP or one of its other names as their employer on the register; 390 of them were admitted before 2023, and 305 of the 492 give an office in New York, NY. The 5 whose admission is closest to 2023, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Bruna Barbosa | 2023 | Currently registered |
| Iqra Abdul-Aziz Bawany | 2023 | Currently registered |
| Stuart David Bibeau | 2023 | Currently registered |
| David James Breyer | 2023 | Currently registered |
| Suzanne Chami | 2023 | 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
Aideen Madeleine Jeanne Brennan studied at McGill University Faculty of Law (the register spells it “McGill University”). 124 of its 1,009 living graduates on the register were admitted in the 2020s, as Aideen Madeleine Jeanne Brennan was.
- Same law school
- 1,009living graduates; 87.8% 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, 81,173 were admitted before 2023 and 8,718 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, 390 of the others admitted before 2023; 305 of the 492 give an office in New York, NY.
- McGill University Faculty of Law graduates on the register1,009 living, 87.8% 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 20238,985 people admitted in 2023 are on the register, 2,775 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 Aideen Madeleine Jeanne Brennan’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 Aideen Madeleine Jeanne Brennan in 2023. 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).