PlainAttorney Register file of Sep 29, 2026 · NY Office of Court Administration, via data.ny.gov

Jonathan B. Leiken

On the New York attorney register since 1998 · office in Washington, DC

PlainAttorney’s reading of the public register file, not a court record.

Registration No.
2937654
Admitted
1998 · First Department
Status
was Delinquent now Currently registered
Next registration
Oct 2028

Jonathan B. Leiken is currently registered on the New York attorney register file of Sep 29, 2026. Admitted in 1998 in the First Department, with an office in Washington, DC; next registration due Oct 2028. The Aug 6, 2026 file listed this registration as delinquent.

What this status means on the register

On the register, “Currently registered” means Jonathan B. Leiken has filed the biennial registration the court system requires; the next one is due in Oct 2028.

  1. was Delinquent now Currently registered changed since the Aug 6, 2026 file
  2. Delinquent unchanged
  3. Delinquent the first file we hold

A change of standing between the 3 files of the last twelve months 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.

Where this record sits on the register

Jonathan B. Leiken studied at University of Pennsylvania Carey Law School (the register spells it “UNIVERSITY OF PENNSYLVANIA”). 1,069 of its 6,843 living graduates on the register were admitted in the 1990s, as Jonathan B. Leiken was.

Same law school
6,843living graduates; 88.7% registered (current or due), against 87.1% overall
Office in Washington, DC
12,527living registrants (outside New York State)

Of the 12,527 living registrants with an office in Washington, DC, 2,316 were admitted before 1998 and 9,975 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

  1. University of Pennsylvania Carey Law School graduates on the register6,843 living, 88.7% registered.
  2. New York-admitted attorneys in Washington, DC12,527 living registrants give an office there.
  3. Admitted in 19987,302 people admitted in 1998 are on the register, 2,659 of them through the First Department.
  4. Every registration that reads “Currently registered”286,911 on the register file of Sep 29, 2026, by decade of admission.
  5. 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 Jonathan B. Leiken’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 Jonathan B. Leiken in 1998. 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).

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