New York attorney record · Judicial Dept 2
Michael J. O'Sullivan
St John University alumna, admitted to the New York bar in 1986, registered office in Huntington, NY. A half-lifetime's worth of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1986
- Admitted
- 40
- Years in bar
- 2023315
- NY reg #
The record in one line
Michael J. O'Sullivan has spent 40 years on the register since admission in 1986, one of the longest-standing active practitioners the state bar carries at 86% tenure percentile.
- 40 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 14%
- by tenure among active NY attorneys
- Law school
- St John University
Data updated May 2026
What this profile tells you
Bar status & tenure
Michael J. O'Sullivan has carried New York bar registration 2023315 for the better part of a career, still active and in good standing. Registration is recorded within Judicial Department 2, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Allan B. Mendelsohn, LLP, located in Huntington, NY (Suffolk County), ZIP 11743. 1 other attorney shares this firm affiliation in the registry. Educational background: ST JOHN UNIVERSITY (96 registered alumni).
State context & due diligence
Across a career spanning 40 years, Michael J. O'Sullivan has remained part of the New York bar's active cohort, a share of the register detailed further below.
Experience vs. the active New York bar
Michael J. O'Sullivan's 40 years since a 1986 admission places this record near the far edge of the statewide tenure curve below.
40 years on the New York bar
Years since admission, all currently-active NY attorneys
40 Top 14% higher than 86% 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
How Michael compares to fellow St John University alumni
Among the 69 St John University graduates in the New York register, Michael J. O'Sullivan is longer-tenured than 54% - a school-cohort view of experience, alongside the statewide one above.
40 years vs. St John University alumni
Years since admission - 69 NY-registered alumni of this school
40 Top 46% higher than 54% of 69 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 · May 2026
St John University's active-bar rate
Of St John University's 96 alumni in the New York register, 46.9% currently hold "Currently registered" status, below the statewide average.
St John University alumni, active-bar rate
The 1986 admission class today
Of the 6,111 attorneys admitted to the New York bar in 1986, 57.6% are still "Currently registered" today, below the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 2023315
- Year Admitted
- 1986 (40 yrs · veteran)
- Judicial Department
- 2
- Next Registration
- Mar 2028
Location & Contact
- Company
- Allan B. Mendelsohn, LLP
- City
- Huntington, NY
- County
- Suffolk
- ZIP Code
- 11743
- Phone
- (631) 923-1625
Education
Status Distribution Across the New York Bar
Michael J. O'Sullivan'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 Allan B. Mendelsohn, LLP
View all attorneys at this firm →Verify This Attorney
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Compare credentials side-by-side
Compare Michael J. O'Sullivan with similar attorneys in Huntington.
Compare attorneys →Before you rely on this record
Michael J. O'Sullivan'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 Michael O'Sullivan licensed?
Michael O'Sullivan is licensed to practice law in New York.
When was Michael J. O'Sullivan admitted to the bar?
Michael J. O'Sullivan's admission to the New York bar dates back to 1986.
Where did Michael J. O'Sullivan go to law school?
Michael J. O'Sullivan attended ST JOHN UNIVERSITY.
What company does Michael J. O'Sullivan work for?
Michael J. O'Sullivan is associated with Allan B. Mendelsohn, LLP in Huntington, NY.
Is Michael J. O'Sullivan in good standing?
Yes, Michael J. O'Sullivan 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.