New York attorney record · Judicial Dept 1
Mary Regina Mcmahon
University Of London alumna, admitted to the New York bar in 2005, registered office in New York, NY. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2005
- Admitted
- 21
- Years in bar
- 4316626
- NY reg #
The record in one line
Mary Regina Mcmahon has held an active New York bar license for 21 years - admitted in 2005, longer-tenured than 51% of the state's currently-active attorneys.
- 21 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 49%
- by tenure among active NY attorneys
- Law school
- University Of London
Data updated May 2026
What this profile tells you
Bar status & tenure
Mary Regina Mcmahon carries New York bar registration 4316626, an established, active practitioner in 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 And Cromwell LLP, located in New York, NY (New York County), ZIP 10004. 5 other attorneys share this firm affiliation in the registry. Educational background: University of London (81 registered alumni).
State context & due diligence
With an established practice on record, Mary Regina Mcmahon remains inside the New York bar's active cohort - see below for how that share of the register compares.
Experience vs. the active New York bar
Mary Regina Mcmahon was admitted in 2005, giving 21 years on the New York register. The histogram places that tenure against every currently-active attorney in the state, taller bars hold more attorneys at that experience level.
21 years on the New York bar
Years since admission, all currently-active NY attorneys
21 Top 49% higher than 51% of 284,296 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 · May 2026
University Of London's active-bar rate
Of University Of London's 81 alumni in the New York register, 65.4% currently hold "Currently registered" status, below the statewide average.
University Of London alumni, active-bar rate
The 2005 admission class today
Of the 8,525 attorneys admitted to the New York bar in 2005, 82.9% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4316626
- Year Admitted
- 2005 (21 yrs · senior)
- Judicial Department
- 1
- Next Registration
- Nov 2027
Location & Contact
- Company
- Sullivan And Cromwell LLP
- City
- New York, NY
- County
- New York
- ZIP Code
- 10004
- Phone
- (212) 558-7271
Education
Status Distribution Across the New York Bar
Mary Regina Mcmahon's current status, "Currently registered", places this attorney in the 66.2% of the 429,620-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.
Other Attorneys at Sullivan And Cromwell LLP
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Mary Regina Mcmahon'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 Mary Mcmahon licensed?
Mary Mcmahon is licensed to practice law in New York.
When was Mary Regina Mcmahon admitted to the bar?
Mary Regina Mcmahon was admitted to the bar in 2005.
Where did Mary Regina Mcmahon go to law school?
Mary Regina Mcmahon attended University of London.
What company does Mary Regina Mcmahon work for?
Mary Regina Mcmahon is associated with Sullivan And Cromwell LLP in New York, NY.
Is Mary Regina Mcmahon in good standing?
Yes, Mary Regina Mcmahon holds active bar status ("Currently registered").
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.