Frederick Ryan Del Tremedal Castillo
On the New York attorney register since 2012 · office in New York, NY
PlainAttorney’s reading of the public register file, not a court record.
- Registration No.
- 5015458
- Admitted
- 2012 · Third Department
- Status
- Currently registered
- Next registration
- Oct 2028
Frederick Ryan Del Tremedal Castillo is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 2012 in the Third 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 Frederick Ryan Del Tremedal Castillo 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.
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; 220 of them were admitted before 2012, and 305 of the 492 give an office in New York, NY. The 5 whose admission is closest to 2012, earliest first:
| Attorney | Admitted | Status |
|---|---|---|
| James Tyler Adams | 2012 | Currently registered |
| Paul Joseph Astolfi | 2012 | Due to re‑register |
| David Joseph Goett | 2012 | Currently registered |
| Scott Alan McMurry | 2012 | Currently registered |
| Holly Anne Morgan | 2012 | Suspended, delinquent |
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
Frederick Ryan Del Tremedal Castillo studied at Harvard Law School. 3,482 of its 14,378 living graduates on the register were admitted in the 2010s, as Frederick Ryan Del Tremedal Castillo was.
- Same law school
- 14,378living graduates; 86.1% 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, 52,244 were admitted before 2012 and 39,126 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, 220 of the others admitted before 2012; 305 of the 492 give an office in New York, NY.
- Harvard Law School graduates on the register14,378 living, 86.1% 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 20129,632 people admitted in 2012 are on the register, 4,129 of them through the Third 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 Frederick Ryan Del Tremedal Castillo’s standing, contact the Attorney Registration Unit of the NY Office of Court Administration (nycourts.gov/attorneys), or ask the Appellate Division, Third Department, which admitted Frederick Ryan Del Tremedal Castillo in 2012. 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).