New York attorney record · Judicial Dept 2
Sean J. O'Sullivan
Hofstra alumna, admitted to the New York bar in 1988, registered office in Albertson, NY. Decades of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1988
- Admitted
- 38
- Years in bar
- 2170389
- NY reg #
The record in one line
With 38 years on the register since a 1988 admission, Sean J. O'Sullivan ranks among the New York bar's most senior active practitioners, longer-tenured than 79% of the currently-active bar.
- 38 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #14 of 41
- by tenure in Albertson office peers
- Law school
- Hofstra
Data updated September 2026
What this profile tells you
Bar status & tenure
Registration 2170389 with the New York bar authority has long belonged to Sean J. O'Sullivan, a veteran practitioner still in active 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 Ahmuty Demers & Mcmanus, located in Albertson, NY (Nassau County), ZIP 11507. 5 other attorneys share this firm affiliation in the registry. Educational background: HOFSTRA.
State context & due diligence
After 38 years on the register, Sean J. O'Sullivan 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 Sean J. O'Sullivan's 38 years since admission in 1988.
38 years on the New York bar
Years since admission, all currently-active NY attorneys
38 Top 21% higher than 79% 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 · September 2026
Tenure among Albertson, NY office peers
Within Albertson, NY's 41-attorney local set, Sean J. O'Sullivan is #14 by tenure, a small-cohort read, not a statewide claim. See the Albertson attorney directory .
- Local rank
- #14
- City cohort
- 41
- Local percentile
- 32nd
- Admitted
- 1988
Nearest tenure peers in Albertson
- Frank J. Pecorelli Jr admitted 1988 · 38 yr
- Scott Louis Benjamin admitted 1987 · 39 yr
- Janice Berkowitz admitted 1989 · 37 yr
- Nicholas P. Calabria Jr admitted 1989 · 37 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 September 2026. Derived local rank, not published upstream.
How Sean compares to fellow Hofstra alumni
Among the 1,287 Hofstra graduates in the New York register, Sean J. O'Sullivan is longer-tenured than 74%.
38 years vs. Hofstra alumni
Years since admission - 1,287 NY-registered alumni of this school
38 Top 26% higher than 74% of 1,287 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 · September 2026
The 1988 admission class today
Of the 6,238 attorneys admitted to the New York bar in 1988, 56.7% are still "Currently registered" today, below the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 2170389
- Year Admitted
- 1988 (38 yrs · veteran)
- Judicial Department
- 2
- Next Registration
- Jan 2028
Location & Contact
- Company
- Ahmuty Demers & Mcmanus
- City
- Albertson, NY
- County
- Nassau
- ZIP Code
- 11507
- Phone
- (516) 294-5433
Education
HOFSTRA
Status Distribution Across the New York Bar
Sean J. O'Sullivan'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: Ahmuty Demers & Mcmanus
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure Hofstra alumni
Fellow alumni on the NY register whose admission year is closest to 1988 (excluding same-firm colleagues above).
Same admission year (1988), other cities
NY-registered attorneys admitted in 1988 whose listed office city differs from Albertson, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Sean J. O'Sullivan: closest NY bar admission year outside NY, and closest out-of-state office cities by how many NY-registered attorneys they list (~42 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~1988)
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
Sean 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 Sean O'Sullivan licensed?
Sean O'Sullivan is licensed to practice law in New York.
When was Sean J. O'Sullivan admitted to the bar?
Sean J. O'Sullivan's admission to the New York bar dates back to 1988.
Where did Sean J. O'Sullivan go to law school?
Sean J. O'Sullivan attended HOFSTRA.
What company does Sean J. O'Sullivan work for?
Sean J. O'Sullivan is associated with Ahmuty Demers & Mcmanus in Albertson, NY.
Is Sean J. O'Sullivan in good standing?
Yes, Sean J. O'Sullivan 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.