New York attorney record · Judicial Dept 2
Shannon Duignan O'Brien
St. Johns University School Of Law alumna, admitted to the New York bar in 2022, registered office in Garden City South, NY. As a recent entrant to the registry, this record's status, address, and admission date come straight from the NY Office of Court Administration.
- 2022
- Admitted
- 4
- Years in bar
- 5951595
- NY reg #
The record in one line
Shannon Duignan O'Brien is early in an active New York law career - admitted to the bar in 2022 and on active status for 4 years so far, already ahead of 0% of the state's active bar by tenure.
- 4 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #11 of 10
- by tenure in Garden City South office peers
- Law school
- St. Johns University School Of Law
Data updated August 2026
What this profile tells you
Bar status & tenure
Shannon Duignan O'Brien holds bar number 5951595 with the New York bar authority, a recent active-status addition to the roll. Registration is recorded within Judicial Department 2, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Mahon, Mahon, Kerins & O'Brien, LLC, located in Garden City South, NY (Nassau County), ZIP 11530. 3 other attorneys share this firm affiliation in the registry. Educational background: St. Johns University School of Law.
State context & due diligence
As a recent addition to the register, Shannon Duignan O'Brien counts toward the New York bar's active cohort; the breakdown below shows how that group stacks up against the rest of the register.
Experience vs. the active New York bar
Shannon Duignan O'Brien is a recent addition to the active New York bar, admitted in 2022. The histogram below shows where 4 years of tenure falls among every currently-active attorney in the state.
4 years on the New York bar
Years since admission, all currently-active NY attorneys
4 Top 100% higher than 0% 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 Garden City South, NY office peers
Garden City South, NY carries only 10 NY-registered attorneys with an admission year on file; Shannon Duignan O'Brien is #11 by tenure in that small local set. See the Garden City South attorney directory .
- Local rank
- #11
- City cohort
- 10
- Local percentile
- 99th
- Admitted
- 2022
Nearest tenure peers in Garden City South
- Joseph Andrew Hyland admitted 2000 · 26 yr
- Peter Menoudakos admitted 1997 · 29 yr
- Thomas Francis Hoering admitted 1994 · 32 yr
- Beth Alice Swendsen-Dowd admitted 1990 · 36 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 Shannon compares to fellow St. Johns University School Of Law alumni
Among the 1,505 St. Johns University School Of Law graduates in the New York register, Shannon Duignan O'Brien is longer-tenured than 0%.
4 years vs. St. Johns University School Of Law alumni
Years since admission - 1,505 NY-registered alumni of this school
4 Top 100% higher than 0% of 1,505 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
The 2022 admission class today
Of the 7,736 attorneys admitted to the New York bar in 2022, 76.7% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 5951595
- Year Admitted
- 2022 (4 yrs · early career)
- Judicial Department
- 2
- Next Registration
- Nov 2026
Location & Contact
- Company
- Mahon, Mahon, Kerins & O'Brien, LLC
- County
- Nassau
- ZIP Code
- 11530
- Phone
- (516) 601-0714
Education
St. Johns University School of Law
Status Distribution Across the New York Bar
Shannon Duignan O'Brien'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: Mahon, Mahon, Kerins & O'Brien, LLC
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure St. Johns University School Of Law alumni
Fellow alumni on the NY register whose admission year is closest to 2022 (excluding same-firm colleagues above).
Same admission year (2022), other cities
NY-registered attorneys admitted in 2022 whose listed office city differs from Garden City South, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Shannon Duignan O'Brien: closest NY bar admission year outside NY, and closest out-of-state office cities by how many NY-registered attorneys they list (~11 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2022)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
Verify This Attorney
Verify on NY Courts Attorney SearchNearby Attorneys in Garden City South, NY
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Compare attorneys →Before you rely on this record
Shannon Duignan O'Brien'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 Shannon O'Brien licensed?
Shannon O'Brien is licensed to practice law in New York.
When was Shannon Duignan O'Brien admitted to the bar?
Shannon Duignan O'Brien was admitted to the New York bar in 2022, 4 years ago.
Where did Shannon Duignan O'Brien go to law school?
Shannon Duignan O'Brien attended St. Johns University School of Law.
What company does Shannon Duignan O'Brien work for?
Shannon Duignan O'Brien is associated with Mahon, Mahon, Kerins & O'Brien, LLC in Garden City South, NY.
Is Shannon Duignan O'Brien in good standing?
Yes, Shannon Duignan O'Brien 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.