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"
- Top 14%
- by tenure among active NY attorneys
- Law school
- University Of Buffalo
Data updated May 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 (928 registered alumni).
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 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 Mark compares to fellow University Of Buffalo alumni
Among the 316 University Of Buffalo graduates in the New York register, Mark S. Klein is longer-tenured than 90% - a school-cohort view of experience, alongside the statewide one above.
43 years vs. University Of Buffalo alumni
Years since admission - 316 NY-registered alumni of this school
43 Top 10% higher than 90% of 316 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
University Of Buffalo's active-bar rate
Of University Of Buffalo's 928 alumni in the New York register, 37% currently hold "Currently registered" status, below the statewide average.
University Of Buffalo alumni, active-bar rate
The 1983 admission class today
Of the 5,424 attorneys admitted to the New York bar in 1983, 65.7% are still "Currently registered" today, below 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
Status Distribution Across the New York Bar
Mark S. Klein'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.
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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").
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.