New York attorney record · Judicial Dept 4
Derek Allan Thomson
Suny At Buffalo alumna, admitted to the New York bar in 2003, registered office in Le Roy, NY. This established record's status, address, and registration history come straight from the NY Office of Court Administration.
- 2003
- Admitted
- 23
- Years in bar
- 4099487
- NY reg #
The record in one line
Derek Allan Thomson has held an active New York bar license for 23 years - admitted in 2003, longer-tenured than 51% of the state's currently-active attorneys.
- 23 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #8 of 11
- by tenure in Le Roy office peers
- Law school
- Suny At Buffalo
Data updated August 2026
What this profile tells you
Bar status & tenure
Derek Allan Thomson carries New York bar registration 4099487, an established, active practitioner in good standing. Registration is recorded within Judicial Department 4, the appellate division overseeing this attorney's home district.
Practice context & education
Practice address is listed under Genesee Valley Boces, located in Le Roy, NY (Genesee County), ZIP 14482. 3 other attorneys share this firm affiliation in the registry. Educational background: SUNY AT BUFFALO (2,896 registered alumni).
State context & due diligence
With an established practice on record, Derek Allan Thomson 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
Derek Allan Thomson was admitted in 2003, giving 23 years on the New York register.
23 years on the New York bar
Years since admission, all currently-active NY attorneys
23 Top 49% higher than 51% 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 Le Roy, NY office peers
In the small Le Roy, NY cohort (11 with admission years), Derek Allan Thomson ranks #8 by tenure. See the Le Roy attorney directory .
- Local rank
- #8
- City cohort
- 11
- Local percentile
- 64th
- Admitted
- 2003
Nearest tenure peers in Le Roy
- Mark Sturdivant Boylan admitted 1994 · 32 yr
- Manley Clifford Crane admitted 1991 · 35 yr
- Jake Michael Whiting admitted 2015 · 11 yr
- Stephen Matthew Mahoney admitted 1990 · 36 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 Derek compares to fellow Suny At Buffalo alumni
Among the 1,234 Suny At Buffalo graduates in the New York register, Derek Allan Thomson is longer-tenured than 4%.
23 years vs. Suny At Buffalo alumni
Years since admission - 1,234 NY-registered alumni of this school
23 Top 96% higher than 4% of 1,234 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
Suny At Buffalo's active-bar rate
Of Suny At Buffalo's 2,896 alumni in the New York register, 60.5% currently hold "Currently registered" status, below the statewide average.
The 2003 admission class today
Of the 8,250 attorneys admitted to the New York bar in 2003, 83.9% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 4099487
- Year Admitted
- 2003 (23 yrs · senior)
- Judicial Department
- 4
- Next Registration
- Mar 2027
Location & Contact
- Company
- Genesee Valley Boces
- City
- Le Roy, NY
- County
- Genesee
- ZIP Code
- 14482
- Phone
- (585) 344-7900
Education
Status Distribution Across the New York Bar
Derek Allan Thomson'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: Genesee Valley Boces
Other NY-registered attorneys who share this firm name on the OCA register (not a geographic peer set).
Near-tenure Suny At Buffalo alumni
Fellow alumni on the NY register whose admission year is closest to 2003 (excluding same-firm colleagues above).
Same admission year (2003), other cities
NY-registered attorneys admitted in 2003 whose listed office city differs from Le Roy, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Derek Allan Thomson: closest NY bar admission year outside NY, and closest out-of-state office cities by how many NY-registered attorneys they list (~12 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~2003)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
Verify This Attorney
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Compare attorneys →Before you rely on this record
Derek Allan Thomson'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 Derek Thomson licensed?
Derek Thomson is licensed to practice law in New York.
When was Derek Allan Thomson admitted to the bar?
Derek Allan Thomson was admitted to the bar in 2003.
Where did Derek Allan Thomson go to law school?
Derek Allan Thomson attended SUNY AT BUFFALO.
What company does Derek Allan Thomson work for?
Derek Allan Thomson is associated with Genesee Valley Boces in Le Roy, NY.
Is Derek Allan Thomson in good standing?
Yes, Derek Allan Thomson 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.