William Peter Mahon
On the New York attorney register since 1980 · office in West Chester, PA
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 1678184
- Admitted
- 1980 · Second Department
- Status
- Currently registered
- Next registration
- Oct 2028
William Peter Mahon is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1980 in the Second Department, with an office in West Chester, PA; next registration due Oct 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 Peter Mahon has filed the biennial registration the court system requires; the next one is due in Oct 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.
Where this record sits on the register
William Peter Mahon studied at University of Dayton School of Law (the register spells it “UNIVERSITY OF DAYTON”). 123 of its 452 living graduates on the register were admitted in the 1980s, as William Peter Mahon was.
- Same law school
- 452living graduates; 88.5% registered (current or due), against 87.1% overall
- Office in West Chester, PA
- 38living registrants (outside New York State)
Of the 38 living registrants with an office in West Chester, PA, 1 were admitted before 1980 and 34 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
- University of Dayton School of Law graduates on the register452 living, 88.5% registered.
- New York-admitted attorneys in West Chester, PA38 living registrants give an office there.
- Admitted in 19804,659 people admitted in 1980 are on the register, 1,976 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 Peter Mahon’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 Peter Mahon in 1980. 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).