New York attorney record · Judicial Dept 3
Tatsuya Koyama
The University Of Chicago Law School alumna, admitted to the New York bar in 2014, registered office in Washington Dc, DC. This record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2014
- Admitted
- 12
- Years in bar
- 5262985
- NY reg #
The record in one line
Admitted in 2014, Tatsuya Koyama has built 12 years of active New York practice - more tenure than 25% of the state's currently-active attorneys.
- 12 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #21 of 36
- by tenure in Washington Dc office peers
- Law school
- The University Of Chicago Law School
Data updated August 2026
What this profile tells you
Bar status & tenure
Bar number 5262985 on the New York register belongs to Tatsuya Koyama, currently in active standing. Registration is recorded within Judicial Department 3, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Mayer Brown LLP, located in Washington Dc, DC, ZIP 20006. 5 other attorneys share this firm affiliation in the registry. Educational background: THE UNIVERSITY OF CHICAGO LAW SCHOOL (108 registered alumni).
State context & due diligence
Tatsuya Koyama 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
12 years into an active New York practice since a 2014 admission, Tatsuya Koyama sits here on the statewide experience curve - taller bars hold more attorneys at that experience level.
12 years on the New York bar
Years since admission, all currently-active NY attorneys
12 Top 75% higher than 25% 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 Washington Dc, DC office peers
In the small Washington Dc, DC cohort (36 with admission years), Tatsuya Koyama ranks #21 by tenure. See the Washington Dc attorney directory .
- Local rank
- #21
- City cohort
- 36
- Local percentile
- 56th
- Admitted
- 2014
Nearest tenure peers in Washington Dc
- Steven Michael Dejong admitted 2014 · 12 yr
- Deborah Heidi Share admitted 2014 · 12 yr
- Anisha Pallavi Gupta admitted 2015 · 11 yr
- Chang Liu admitted 2016 · 10 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 Tatsuya compares to fellow The University Of Chicago Law School alumni
Among the 100 The University Of Chicago Law School graduates in the New York register, Tatsuya Koyama is longer-tenured than 15%.
12 years vs. The University Of Chicago Law School alumni
Years since admission - 100 NY-registered alumni of this school
12 Top 85% higher than 15% of 100 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 University Of Chicago Law School's active-bar rate
Of The University Of Chicago Law School's 108 alumni in the New York register, 75.9% currently hold "Currently registered" status, above the statewide average.
The 2014 admission class today
Of the 10,747 attorneys admitted to the New York bar in 2014, 71.5% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 5262985
- Year Admitted
- 2014 (12 yrs · mid-career)
- Judicial Department
- 3
- Next Registration
- Feb 2028
Location & Contact
- Company
- Mayer Brown LLP
- City
- Washington Dc, DC
- ZIP Code
- 20006
- Phone
- (202) 263-3117
Education
Status Distribution Across the New York Bar
Tatsuya Koyama'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: Mayer Brown LLP
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure The University Of Chicago Law School alumni
Fellow alumni on the NY register whose admission year is closest to 2014 (excluding same-firm colleagues above).
Same admission year (2014), other cities
NY-registered attorneys admitted in 2014 whose listed office city differs from Washington Dc, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Tatsuya Koyama: closest NY bar admission year outside DC, and closest out-of-state office cities by how many NY-registered attorneys they list (~37 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2014)
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 Washington Dc, DC
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Compare Tatsuya Koyama with similar attorneys in Washington Dc.
Compare attorneys →Before you rely on this record
Tatsuya Koyama'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 Tatsuya Koyama licensed?
Tatsuya Koyama is licensed to practice law in New York.
When was Tatsuya Koyama admitted to the bar?
Tatsuya Koyama has been on the New York bar register since 2014.
Where did Tatsuya Koyama go to law school?
Tatsuya Koyama attended THE UNIVERSITY OF CHICAGO LAW SCHOOL.
What company does Tatsuya Koyama work for?
Tatsuya Koyama is associated with Mayer Brown LLP in Washington Dc, DC.
Is Tatsuya Koyama in good standing?
Yes, Tatsuya Koyama 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.