New York attorney record · Judicial Dept 1
Marguerite Agnes O'Brien
Vanderbilt University Law School alumna, admitted to the New York bar in 2019, registered office in Wilmington, DE. This record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2019
- Admitted
- 7
- Years in bar
- 5694245
- NY reg #
The record in one line
Admitted in 2019, Marguerite Agnes O'Brien has built 7 years of active New York practice - more tenure than 13% of the state's currently-active attorneys.
- 7 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #298 of 370
- by tenure in Wilmington office peers
- Law school
- Vanderbilt University Law School
Data updated August 2026
What this profile tells you
Bar status & tenure
Bar number 5694245 on the New York register belongs to Marguerite Agnes O'Brien, currently in active 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 Ross Aronstam & Moritz LLP, located in Wilmington, DE, ZIP 19801. 4 other attorneys share this firm affiliation in the registry. Educational background: Vanderbilt University Law School (929 registered alumni).
State context & due diligence
Marguerite Agnes O'Brien is currently part of the New York bar's active cohort, a group the breakdown below sizes against the full register.
Experience vs. the active New York bar
7 years into an active New York practice since a 2019 admission, Marguerite Agnes O'Brien sits here on the statewide experience curve - taller bars hold more attorneys at that experience level.
7 years on the New York bar
Years since admission, all currently-active NY attorneys
7 Top 87% higher than 13% 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 Wilmington, DE office peers
Marguerite Agnes O'Brien is among the longer-standing NY-bar records in Wilmington, DE: #298 of 370 by years since admission (80th percentile locally). See the Wilmington attorney directory .
- Local rank
- #298
- City cohort
- 370
- Local percentile
- 80th
- Admitted
- 2019
Nearest tenure peers in Wilmington
- Christine Jade Chen admitted 2019 · 7 yr
- Carol Ann Diprinzio admitted 2019 · 7 yr
- Megan Erin Hunt admitted 2019 · 7 yr
- Catherine Creighton Lyons admitted 2019 · 7 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 Marguerite compares to fellow Vanderbilt University Law School alumni
Among the 853 Vanderbilt University Law School graduates in the New York register, Marguerite Agnes O'Brien is longer-tenured than 32%.
7 years vs. Vanderbilt University Law School alumni
Years since admission - 853 NY-registered alumni of this school
7 Top 68% higher than 32% of 853 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
Vanderbilt University Law School's active-bar rate
Of Vanderbilt University Law School's 929 alumni in the New York register, 85.4% currently hold "Currently registered" status, above the statewide average.
The 2019 admission class today
Of the 8,536 attorneys admitted to the New York bar in 2019, 94.7% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 5694245
- Year Admitted
- 2019 (7 yrs · mid-career)
- Judicial Department
- 1
- Next Registration
- May 2027
Location & Contact
- Company
- Ross Aronstam & Moritz LLP
- City
- Wilmington, DE
- ZIP Code
- 19801
- Phone
- (302) 576-1600
Education
Status Distribution Across the New York Bar
Marguerite Agnes 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: Ross Aronstam & Moritz LLP
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure Vanderbilt University Law School alumni
Fellow alumni on the NY register whose admission year is closest to 2019 (excluding same-firm colleagues above).
Same admission year (2019), other cities
NY-registered attorneys admitted in 2019 whose listed office city differs from Wilmington, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Marguerite Agnes O'Brien: closest NY bar admission year outside DE, and closest out-of-state office cities by how many NY-registered attorneys they list (~371 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2019)
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 Wilmington, DE
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Compare attorneys →Before you rely on this record
Marguerite Agnes 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 Marguerite O'Brien licensed?
Marguerite O'Brien is licensed to practice law in New York.
When was Marguerite Agnes O'Brien admitted to the bar?
Marguerite Agnes O'Brien has been on the New York bar register since 2019.
Where did Marguerite Agnes O'Brien go to law school?
Marguerite Agnes O'Brien attended Vanderbilt University Law School.
What company does Marguerite Agnes O'Brien work for?
Marguerite Agnes O'Brien is associated with Ross Aronstam & Moritz LLP in Wilmington, DE.
Is Marguerite Agnes O'Brien in good standing?
Yes, Marguerite Agnes 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.