New York attorney record · Judicial Dept 1
Marc De Leeuw
Columbia alumna, admitted to the New York bar in 1993, registered office in New York, NY. Decades of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1993
- Admitted
- 33
- Years in bar
- 2542942
- NY reg #
The record in one line
With 33 years on the register since a 1993 admission, Marc De Leeuw ranks among the New York bar's most senior active practitioners, longer-tenured than 71% of the currently-active bar.
- 33 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #17605 of 93,608
- by tenure in New York office peers
- Law school
- Columbia
Data updated August 2026
What this profile tells you
Bar status & tenure
Registration 2542942 with the New York bar authority has long belonged to Marc De Leeuw, a veteran practitioner still in active good standing. Registration is recorded within Judicial Department 1, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Sullivan & Cromwell LLP, located in New York, NY (New York County), ZIP 10004. 5 other attorneys share this firm affiliation in the registry. Educational background: COLUMBIA (5,610 registered alumni).
State context & due diligence
After 33 years on the register, Marc De Leeuw still falls within the New York bar's active cohort, a share of the register detailed further below.
Experience vs. the active New York bar
Few active New York attorneys match Marc De Leeuw's 33 years since admission in 1993.
33 years on the New York bar
Years since admission, all currently-active NY attorneys
33 Top 29% higher than 71% of 290,787 active NY attorneys
Each bar is a band; taller bars hold more active NY attorneys. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · August 2026
Tenure among New York, NY office peers
Marc De Leeuw is earlier in the New York, NY office cohort than most peers: local tenure rank #17,605 of 93,608 (19th percentile). See the New York attorney directory .
- Local rank
- #17,605
- City cohort
- 93,608
- Local percentile
- 19th
- Admitted
- 1993
Nearest tenure peers in New York
- David Abramovitz admitted 1993 · 33 yr
- Daniel Abrams admitted 1993 · 33 yr
- Marc Edward Ackerman admitted 1993 · 33 yr
- Gaston Jose Acosta-Rua admitted 1993 · 33 yr
How local rank is computed
Rank uses years since NY-bar admission among non-deceased registry rows that list the same office city and state, a local placement, not a statewide claim. Source: NY Office of Court Administration Attorney Registration · as of August 2026. Derived local rank, not published upstream.
How Marc compares to fellow Columbia alumni
Among the 2,448 Columbia graduates in the New York register, Marc De Leeuw is longer-tenured than 69%.
33 years vs. Columbia alumni
Years since admission - 2,448 NY-registered alumni of this school
33 Top 31% higher than 69% of 2,448 fellow alumni
Each bar is a band; taller bars hold more fellow alumni. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NY Office of Court Administration, Attorney Registration · August 2026
Columbia's active-bar rate
Of Columbia's 5,610 alumni in the New York register, 48.8% currently hold "Currently registered" status, below the statewide average.
The 1993 admission class today
Of the 6,439 attorneys admitted to the New York bar in 1993, 77.6% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 2542942
- Year Admitted
- 1993 (33 yrs · veteran)
- Judicial Department
- 1
- Next Registration
- Jan 2027
Location & Contact
- Company
- Sullivan & Cromwell LLP
- City
- New York, NY
- County
- New York
- ZIP Code
- 10004
- Phone
- (212) 558-4219
Education
Status Distribution Across the New York Bar
Marc De Leeuw's current status, "Currently registered", places this attorney in the 67.2% of the 432,625-attorney New York register currently marked active.
Full statewide breakdown & source note
Source: NY Office of Court Administration, Attorney Registrations. Status counts reflect the latest reporting cycle. Bar status confirms registration only; it does not imply competence, specialty fit, or freedom from complaints.
Same firm affiliation: Sullivan & Cromwell LLP
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure Columbia alumni
Fellow alumni on the NY register whose admission year is closest to 1993 (excluding same-firm colleagues above).
Same admission year (1993), other cities
NY-registered attorneys admitted in 1993 whose listed office city differs from New York, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Marc De Leeuw: closest NY bar admission year outside NY, and closest out-of-state office cities by how many NY-registered attorneys they list (~93,609 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~1993)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
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Compare attorneys →Before you rely on this record
Marc De Leeuw's "Currently registered" listing confirms bar standing only, it is a registration fact to verify, not a verdict on quality or competence.
Frequently Asked Questions
Where is Marc De Leeuw licensed?
Marc De Leeuw is licensed to practice law in New York.
When was Marc De Leeuw admitted to the bar?
Marc De Leeuw's admission to the New York bar dates back to 1993.
Where did Marc De Leeuw go to law school?
Marc De Leeuw attended COLUMBIA.
What company does Marc De Leeuw work for?
Marc De Leeuw is associated with Sullivan & Cromwell LLP in New York, NY.
Is Marc De Leeuw in good standing?
Yes, Marc De Leeuw holds active bar status ("Currently registered").
Cite this page & disclosure
Sourced from the NY Office of Court Administration, informational only, not legal advice. Full disclosure.
Read our methodology - how this data is sourced, computed, and verified.