John A. Mackerron III
On the New York attorney register since 1988 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 2187284
- Admitted
- 1988 · First Department
- Status
- Currently registered
- Next registration
- May 2028
John A. Mackerron III is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1988 in the First Department, with an office in New York, NY; next registration due May 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 John A. Mackerron III has filed the biennial registration the court system requires; the next one is due in May 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
438 other attorneys list Orrick, Herrington & Sutcliffe LLP or one of its other names as their employer on the register; 24 of them were admitted before 1988, and 297 of the 439 give an office in New York, NY. The 5 whose admission is closest to 1988, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| John Desire Giansello III | 1988 | Currently registered |
| William S. Haft | 1988 | Currently registered |
| Evan Craig Hollander | 1988 | Due to re‑register |
| Lawrence Timothy Kane | 1988 | Due to re‑register |
| Andrew Mattei | 1988 | Delinquent |
All 439 registrations that list Orrick, Herrington & Sutcliffe LLP
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
John A. Mackerron III studied at UC Law San Francisco (formerly UC Hastings) (the register spells it “UNIVERSITY OF CALIFORNIA, HASTINGS COLLEGE OF THE”). 115 of its 791 living graduates on the register were admitted in the 1980s, as John A. Mackerron III was.
- Same law school
- 791living graduates; 86.3% 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, 11,793 were admitted before 1988 and 80,771 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 Orrick, Herrington & Sutcliffe LLP439 on the register, 24 of the others admitted before 1988; 297 of the 439 give an office in New York, NY.
- UC Law San Francisco (formerly UC Hastings) graduates on the register791 living, 86.3% 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 19886,238 people admitted in 1988 are on the register, 2,076 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 John A. Mackerron III’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 John A. Mackerron III in 1988. 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).