New York attorney record · Judicial Dept 1
William Sean Barrett
University Of Virginia School Of Law alumna, admitted to the New York bar in 1999, registered office in Roseland, NJ. Decades of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1999
- Admitted
- 27
- Years in bar
- 2944908
- NY reg #
The record in one line
With 27 years on the register since a 1999 admission, William Sean Barrett ranks among the New York bar's most senior active practitioners, longer-tenured than 62% of the currently-active bar.
- 27 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #213 of 676
- by tenure in Roseland office peers
- Law school
- University Of Virginia School Of Law
Data updated September 2026
What this profile tells you
Bar status & tenure
Registration 2944908 with the New York bar authority has long belonged to William Sean Barrett, 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 Mandelbaum, Barrett PC, located in Roseland, NJ, ZIP 07068. Educational background: University of Virginia School of Law (5,025 registered alumni).
State context & due diligence
After 27 years on the register, William Sean Barrett 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 William Sean Barrett's 27 years since admission in 1999.
27 years on the New York bar
Years since admission, all currently-active NY attorneys
27 Top 38% higher than 62% 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 Roseland, NJ office peers
Most of the 676 NY-registered attorneys in Roseland, NJ outrank William Sean Barrett on tenure; this record sits at the 31st local percentile (rank #213). See the Roseland attorney directory .
- Local rank
- #213
- City cohort
- 676
- Local percentile
- 31st
- Admitted
- 1999
Nearest tenure peers in Roseland
- Benjamin Charles Curcio admitted 1999 · 27 yr
- Marie T. Defalco admitted 1999 · 27 yr
- George Michael Macchia admitted 1999 · 27 yr
- Philip Alan Markowitz admitted 1999 · 27 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 William compares to fellow University Of Virginia School Of Law alumni
Among the 3,187 University Of Virginia School Of Law graduates in the New York register, William Sean Barrett is longer-tenured than 88%.
27 years vs. University Of Virginia School Of Law alumni
Years since admission - 3,187 NY-registered alumni of this school
27 Top 12% higher than 88% of 3,187 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
University Of Virginia School Of Law's active-bar rate
Of University Of Virginia School Of Law's 5,025 alumni in the New York register, 70.7% currently hold "Currently registered" status, above the statewide average.
The 1999 admission class today
Of the 7,628 attorneys admitted to the New York bar in 1999, 81.9% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 2944908
- Year Admitted
- 1999 (27 yrs · veteran)
- Judicial Department
- 1
- Next Registration
- May 2027
Location & Contact
- Company
- Mandelbaum, Barrett PC
- City
- Roseland, NJ
- ZIP Code
- 07068
- Phone
- (973) 736-4600
Education
Status Distribution Across the New York Bar
William Sean Barrett'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.
Near-tenure University Of Virginia School Of Law alumni
Fellow alumni on the NY register whose admission year is closest to 1999 (excluding same-firm colleagues above).
Same admission year (1999), other cities
NY-registered attorneys admitted in 1999 whose listed office city differs from Roseland, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for William Sean Barrett: closest NY bar admission year outside NJ, and closest out-of-state office cities by how many NY-registered attorneys they list (~677 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~1999)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
Verify This Attorney
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Compare attorneys →Before you rely on this record
William Sean Barrett'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 William Barrett licensed?
William Barrett is licensed to practice law in New York.
When was William Sean Barrett admitted to the bar?
William Sean Barrett's admission to the New York bar dates back to 1999.
Where did William Sean Barrett go to law school?
William Sean Barrett attended University of Virginia School of Law.
What company does William Sean Barrett work for?
William Sean Barrett is associated with Mandelbaum, Barrett PC in Roseland, NJ.
Is William Sean Barrett in good standing?
Yes, William Sean Barrett 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.