New York attorney record · Judicial Dept 4
Mark S. Klein
University Of Buffalo alumna, admitted to the New York bar in 1983, registered office in Buffalo, NY. A half-lifetime's worth of status, address, and registration history on this record come straight from the NY Office of Court Administration.
- 1983
- Admitted
- 43
- Years in bar
- 1843580
- NY reg #
The record in one line
Mark S. Klein has spent 43 years on the register since admission in 1983, one of the longest-standing active practitioners the state bar carries at 86% tenure percentile.
- 43 yrs
- in active practice since admission
- Active
- current bar status: "Currently registered"
- #361 of 3,464
- by tenure in Buffalo office peers
- Law school
- University Of Buffalo
Data updated September 2026
What this profile tells you
Bar status & tenure
Mark S. Klein has carried New York bar registration 1843580 for the better part of a career, still active and 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 The Guaranty Building, located in Buffalo, NY (Erie County), ZIP 14202. Educational background: UNIVERSITY OF BUFFALO.
State context & due diligence
Across a career spanning 43 years, Mark S. Klein has remained part of the New York bar's active cohort, a share of the register detailed further below.
Experience vs. the active New York bar
Mark S. Klein's 43 years since a 1983 admission places this record near the far edge of the statewide tenure curve below.
43 years on the New York bar
Years since admission, all currently-active NY attorneys
43 Top 14% higher than 86% 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 · September 2026
Tenure among Buffalo, NY office peers
Mark S. Klein is earlier in the Buffalo, NY office cohort than most peers: local tenure rank #361 of 3,464 (10th percentile). See the Buffalo attorney directory .
- Local rank
- #361
- City cohort
- 3,464
- Local percentile
- 10th
- Admitted
- 1983
Nearest tenure peers in Buffalo
- Ross Michael Cellino Jr. admitted 1983 · 43 yr
- John Albert Collins admitted 1983 · 43 yr
- Thomas James Eoannou admitted 1983 · 43 yr
- Paula L. Feroleto admitted 1983 · 43 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 September 2026. Derived local rank, not published upstream.
How Mark compares to fellow University Of Buffalo alumni
Among the 309 University Of Buffalo graduates in the New York register, Mark S. Klein is longer-tenured than 90%.
43 years vs. University Of Buffalo alumni
Years since admission - 309 NY-registered alumni of this school
43 Top 10% higher than 90% of 309 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 · September 2026
The 1983 admission class today
Of the 5,424 attorneys admitted to the New York bar in 1983, 67.4% are still "Currently registered" today, above the statewide average across all admission years.
Professional Details
- Status
- Currently registered
- Registration Number
- 1843580
- Year Admitted
- 1983 (43 yrs · veteran)
- Judicial Department
- 4
- Next Registration
- Mar 2027
Location & Contact
- Company
- The Guaranty Building
- City
- Buffalo, NY
- County
- Erie
- ZIP Code
- 14202
- Phone
- (716) 856-4000
Education
UNIVERSITY OF BUFFALO
Status Distribution Across the New York Bar
Mark S. Klein'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 University Of Buffalo alumni
Fellow alumni on the NY register whose admission year is closest to 1983 (excluding same-firm colleagues above).
Same admission year (1983), other cities
NY-registered attorneys admitted in 1983 whose listed office city differs from Buffalo, a vintage cohort, not a neighborhood list.
Nationwide attorneys with similar admission year or city registry density
Two non-geo peer axes for Mark S. Klein: closest NY bar admission year outside NY, and closest out-of-state office cities by how many NY-registered attorneys they list (~3,465 here). Distinct from same-firm, fellow-alumni, and same-year other-city strips above.
Similar admission year (~1983)
Counts come from the NY State Office of Court Administration registration extract; peers are not a competence or practice-area ranking.
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Compare attorneys →Before you rely on this record
Mark S. Klein'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 Mark Klein licensed?
Mark Klein is licensed to practice law in New York.
When was Mark S. Klein admitted to the bar?
Mark S. Klein's admission to the New York bar dates back to 1983.
Where did Mark S. Klein go to law school?
Mark S. Klein attended UNIVERSITY OF BUFFALO.
What company does Mark S. Klein work for?
Mark S. Klein is associated with The Guaranty Building in Buffalo, NY.
Is Mark S. Klein in good standing?
Yes, Mark S. Klein 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.