New York attorney record · Judicial Dept 1
Jayun Koo
Columbia Law School alumna, admitted to the New York bar in 2011, registered office in New York, NY. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2011
- Admitted
- 15
- Years in bar
- 4934444
- NY reg #
The record in one line
Jayun Koo has held an active New York bar license for 15 years - admitted in 2011, longer-tenured than 38% of the state's currently-active attorneys.
- 15 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #50206 of 93,608
- by tenure in New York office peers
- Law school
- Columbia Law School
Data updated August 2026
What this profile tells you
Bar status & tenure
Jayun Koo carries New York bar registration 4934444, an established, active practitioner in 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 Haynes And Boone, LLP, located in New York, NY (New York County), ZIP 10112. 5 other attorneys share this firm affiliation in the registry. Educational background: Columbia Law School (21,451 registered alumni).
State context & due diligence
With an established practice on record, Jayun Koo 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
Jayun Koo was admitted in 2011, giving 15 years on the New York register.
15 years on the New York bar
Years since admission, all currently-active NY attorneys
15 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 New York, NY office peers
Jayun Koo's 15-year NY register tenure places mid-pack in New York, NY: rank #50,206 of 93,608 office peers (54th percentile). See the New York attorney directory .
- Local rank
- #50,206
- City cohort
- 93,608
- Local percentile
- 54th
- Admitted
- 2011
Nearest tenure peers in New York
- Solomon Abady admitted 2011 · 15 yr
- Amanda Ajuma Uchennae Abata admitted 2011 · 15 yr
- Gerard Abate Jr. admitted 2011 · 15 yr
- Johan Robert Abraham admitted 2011 · 15 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 Jayun compares to fellow Columbia Law School alumni
Among the 11,886 Columbia Law School graduates in the New York register, Jayun Koo is longer-tenured than 55%.
15 years vs. Columbia Law School alumni
Years since admission - 11,886 NY-registered alumni of this school
15 Top 45% higher than 55% of 11,886 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 2011 admission class today
Of the 9,856 attorneys admitted to the New York bar in 2011, 88.5% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4934444
- Year Admitted
- 2011 (15 yrs · senior)
- Judicial Department
- 1
- Next Registration
- Jul 2027
Location & Contact
- Company
- Haynes And Boone, LLP
- City
- New York, NY
- County
- New York
- ZIP Code
- 10112
- Phone
- (347) 754-0095
Education
Status Distribution Across the New York Bar
Jayun Koo'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.
Other Attorneys at Haynes And Boone, LLP
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Compare attorneys →Before you rely on this record
Jayun Koo'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 Jayun Koo licensed?
Jayun Koo is licensed to practice law in New York.
When was Jayun Koo admitted to the bar?
Jayun Koo was admitted to the bar in 2011.
Where did Jayun Koo go to law school?
Jayun Koo attended Columbia Law School.
What company does Jayun Koo work for?
Jayun Koo is associated with Haynes And Boone, LLP in New York, NY.
Is Jayun Koo in good standing?
Yes, Jayun Koo 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.