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 24% of the state's currently-active attorneys.
- 12 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- Top 76%
- by tenure among active NY attorneys
- Law school
- The University Of Chicago Law School
Data updated May 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 (109 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 76% higher than 24% of 284,296 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 · May 2026
How Tatsuya compares to fellow The University Of Chicago Law School alumni
Among the 101 The University Of Chicago Law School graduates in the New York register, Tatsuya Koyama is longer-tenured than 15% - a school-cohort view of experience, alongside the statewide one above.
12 years vs. The University Of Chicago Law School alumni
Years since admission - 101 NY-registered alumni of this school
12 Top 85% higher than 15% of 101 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 · May 2026
The University Of Chicago Law School's active-bar rate
Of The University Of Chicago Law School's 109 alumni in the New York register, 76.1% currently hold "Currently registered" status, above the statewide average.
The University Of Chicago Law School alumni, active-bar rate
The 2014 admission class today
Of the 10,747 attorneys admitted to the New York bar in 2014, 70.2% 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 66.2% of the 429,620-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 Mayer Brown LLP
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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").
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.