William Francis Mastrianna III
On the New York attorney register since 2015 · office in Washington, DC
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5327960
- Admitted
- 2015 · Third Department
- Status
- Currently registered
- Next registration
- Jun 2027
William Francis Mastrianna III is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2015 in the Third Department, with an office in Washington, DC. The status is the same in all 3 files we hold.
What this status means on the register
On the register, “Currently registered” means the attorney has filed the biennial registration the court system requires; the next one is due in the month shown. How many hold this status.
- Currently registered unchanged
- Currently registered unchanged
- Currently registered the first file we hold
We show the 3 register files of the last twelve months (Jul 3, 2026, Aug 6, 2026, Sep 29, 2026). A change of standing between them is struck through in red; the routine birthday cycle is not.
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
471 other attorneys list Covington & Burling LLP or one of its other names as their employer on the register. The 5 whose admission is closest to 2015, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| Miho Akada | 2015 | Currently registered |
| Isaac Daniel Chaput | 2015 | Currently registered |
| Alexander Gudko | 2015 | Currently registered |
| John Edward Hall | 2015 | Currently registered |
| Gregory Lawrence Halperin | 2015 | 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 Francis Mastrianna III studied at Villanova University Charles Widger School of Law (the register spells it “Villanova University School of Law”).
- Same law school
- 1,575living graduates; 88.4% registered (current or due), against 87.1% overall
- Office in Washington, DC
- 12,527living registrants give an office there (outside New York State)
Source: NY Office of Court Administration, attorney registration file (data.ny.gov, dataset eqw2-r5nb), downloaded Sep 29, 2026; living registrants only.
How to confirm it officially
The register is published by the court system; PlainAttorney shows it as released. For a statement of an attorney’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division in the attorney’s department. The register places the office outside New York, so a complaint would go to the grievance committee of the Third Department, which admitted this attorney (22 NYCRR 1240.7(a)(2)).
This page reads the register file of Sep 29, 2026; the court system publishes the file every few weeks, so its own search can be newer. The register shows only the current value: a suspension that ended before the files we hold, or discipline short of suspension such as a censure, leaves no trace here. Appellate Division decisions on attorney discipline are published in the New York Official Reports, online through the court system’s Law Reporting Bureau.