William Haselden Ellerbe
On the New York attorney register since 2012 · office in Philadelphia, PA
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5051032
- Admitted
- 2012 · Second Department
- Status
- Currently registered
- Next registration
- Jul 2028
William Haselden Ellerbe is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2012 in the Second Department, with an office in Philadelphia, PA; next registration due Jul 2028. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means William Haselden Ellerbe 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
16 other attorneys list Berger Montague PC or one of its other names as their employer on the register; 8 of them were admitted before 2012, and 12 of the 17 give an office in Philadelphia, PA. The 5 whose admission is closest to 2012, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Peter Hanson Hamner | 2011 | Currently registered |
| Zachary Michael Vaughan | 2012 | Due to re‑register |
| Michaela Louise Wallin | 2014 | Currently registered |
| Caitlin Marie Adorni | 2017 | Currently registered |
| Mariyam Hussain | 2017 | 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
William Haselden Ellerbe studied at University of Michigan Law School (the register spells it “UNIVERSITY OF MICHIGAN”). 1,352 of its 4,806 living graduates on the register were admitted in the 2010s, as William Haselden Ellerbe was.
- Same law school
- 4,806living graduates; 86.9% registered (current or due), against 87.1% overall
- Office in Philadelphia, PA
- 1,878living registrants (outside New York State)
Of the 1,878 living registrants with an office in Philadelphia, PA, 1,036 were admitted before 2012 and 751 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 Berger Montague PC17 on the register, 8 of the others admitted before 2012; 12 of the 17 give an office in Philadelphia, PA.
- University of Michigan Law School graduates on the register4,806 living, 86.9% registered.
- New York-admitted attorneys in Philadelphia, PA1,878 living registrants give an office there.
- Admitted in 20129,632 people admitted in 2012 are on the register, 2,535 of them through the Second 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 Haselden Ellerbe’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Second Department, which admitted William Haselden Ellerbe in 2012. 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).