New York attorney record · Judicial Dept 2
William Sei-Hyun Yoon
Brooklyn Law School alumna, admitted to the New York bar in 2009, registered office in Bayside, NY. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2009
- Admitted
- 17
- Years in bar
- 4708780
- NY reg #
The record in one line
William Sei-Hyun Yoon has held an active New York bar license for 17 years - admitted in 2009, longer-tenured than 38% of the state's currently-active attorneys.
- 17 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #154 of 183
- by tenure in Bayside office peers
- Law school
- Brooklyn Law School
Data updated August 2026
What this profile tells you
Bar status & tenure
William Sei-Hyun Yoon carries New York bar registration 4708780, an established, active practitioner 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 Law Office Of William S. Yoon, Esq., located in Bayside, NY (Queens County), ZIP 11361. Educational background: Brooklyn Law School (18,418 registered alumni).
State context & due diligence
With an established practice on record, William Sei-Hyun Yoon remains inside the New York bar's active cohort - see below for how that share of the register compares.
Experience vs. the active New York bar
William Sei-Hyun Yoon was admitted in 2009, giving 17 years on the New York register.
17 years on the New York bar
Years since admission, all currently-active NY attorneys
17 Top 62% higher than 38% 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 Bayside, NY office peers
In Bayside, NY's NY-registered cohort of 183, William Sei-Hyun Yoon sits at local tenure rank #154 (84th percentile). See the Bayside attorney directory .
- Local rank
- #154
- City cohort
- 183
- Local percentile
- 84th
- Admitted
- 2009
Nearest tenure peers in Bayside
- Kathleen Kim admitted 2009 · 17 yr
- Seonkwon Kim admitted 2009 · 17 yr
- Ruth M. Teitelbaum admitted 2009 · 17 yr
- Edward Charles Braunstein admitted 2010 · 16 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 William compares to fellow Brooklyn Law School alumni
Among the 10,325 Brooklyn Law School graduates in the New York register, William Sei-Hyun Yoon is longer-tenured than 47%.
17 years vs. Brooklyn Law School alumni
Years since admission - 10,325 NY-registered alumni of this school
17 Top 53% higher than 47% of 10,325 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
Brooklyn Law School's active-bar rate
Of Brooklyn Law School's 18,418 alumni in the New York register, 64% currently hold "Currently registered" status, below the statewide average.
Brooklyn Law School alumni, active-bar rate
The 2009 admission class today
Of the 10,203 attorneys admitted to the New York bar in 2009, 87.4% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4708780
- Year Admitted
- 2009 (17 yrs · senior)
- Judicial Department
- 2
- Next Registration
- Aug 2027
Location & Contact
- Company
- Law Office Of William S. Yoon, Esq.
- City
- Bayside, NY
- County
- Queens
- ZIP Code
- 11361
- Phone
- (202) 257-7319
Education
Status Distribution Across the New York Bar
William Sei-Hyun Yoon'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 Brooklyn Law School alumni
Fellow alumni on the NY register whose admission year is closest to 2009 (excluding same-firm colleagues above).
Same admission year (2009), other cities
NY-registered attorneys admitted in 2009 whose listed office city differs from Bayside, a vintage cohort, not a neighborhood list.
Verify This Attorney
Verify on NY Courts Attorney SearchNearby Attorneys in Bayside, NY
Compare credentials side-by-side
Compare William Sei-Hyun Yoon with similar attorneys in Bayside.
Compare attorneys →Before you rely on this record
William Sei-Hyun Yoon'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 Yoon licensed?
William Yoon is licensed to practice law in New York.
When was William Sei-Hyun Yoon admitted to the bar?
William Sei-Hyun Yoon was admitted to the bar in 2009.
Where did William Sei-Hyun Yoon go to law school?
William Sei-Hyun Yoon attended Brooklyn Law School.
What company does William Sei-Hyun Yoon work for?
William Sei-Hyun Yoon is associated with Law Office Of William S. Yoon, Esq. in Bayside, NY.
Is William Sei-Hyun Yoon in good standing?
Yes, William Sei-Hyun Yoon 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.