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Mark T. Walsh was a founding principal of Gleason, Dunn, Walsh & O’Shea and continued as a principal until December 31, 2022.  He is now senior counsel and focuses his practice in the areas of labor and employment law, civil service and administrative law. 

Mr. Walsh has been named one of New York’s “Super Lawyers” for 2009 through the present; one of the “Top 25 Lawyers in the Hudson Valley” (New York Super Lawyers) from 2013 to the present; and one of the top 500 Leading Plaintiff Employment Lawyers in the United States by Lawdragon, for 2019 to the present.

Practice Areas
Bar Admissions
  • New York 
  • United States District Courts: Northern, Southern and Western Districts of New York
  • United States Court of Appeals, Second Circuit
  • United State Supreme Court
  • J.D., Albany Law School of Union University, 1980
  • Albany Law Review Member (1978-1979) and Articles Editor (1979-1980)
  • B.A., Oberlin College, 1977
Professional Associations
  • American Bar Association      
    • Member, Labor and Employment Law Section
Community Involvement

Mr. Walsh has been involved in several youth sports organizations as a board member and as a coach. He served on the board of the Adirondack Chapter of U.S. Lacrosse, Inc. as its Vice President for Legal Affairs. He also serves on the Board of Oberlin College’s John Heisman Club and is currently its president.

Notable/Reported Cases
  • Matter of City of Troy (Troy Police Benevolent & Protective Association, Inc.), 191 A.D.3d 1203 (3d Dept. 2021)
  • Matter of City of Troy (Troy Police Benevolent & Protective Association, Inc.), 191 A.D.3d 1211 (3d Dept. 2021)
  • Rita Flynn v. New York State Department of Corrections and Community Supervision, et al., 2018 BL 153020, 2018 IER Cases 153020 (SDNY, April 30, 2018)
  • Zlotnick v. City of Saratoga Springs, 122 AD3d 1210 (3d Dept. 2014)
  • Bombard v. State of New York, 113 AD3d 954 (3d Dept. 2014)
  • Fitzgerald v. City of Troy, 2013 WL 5442274 (NDNY)
  • The New York State Police Investigators Assn., Local 4 IUPA, AFL-CIO, et al. v. The State of New York, et al., 2012 BL 315640 (NDNY, Dec. 3, 2012)
  • Britt v. DiNapoli, 91 AD3d 1102 (3d Dept. 2012)
  • M & R Ginsburg, LLC v. Orange Canyon Development Co., LLC, 84 AD3d 1470 (3d Dept. 2011)
  • PBA of New York State Troopers, Inc. v. Division of State Police, 29 AD3d 68 (3d Dept. 2006)
  • McIntosh v. State of New York, 7 AD3d 890 (3d Dept. 2004)  
  • Koskey v. McMahon, 299 AD2d 682 (3d Dept. 2002)
  • Truelove v. Northeast Capital & Advisory, Inc., 95 NY 2d 220 (2000)
  • Rogers, et al. v. City of Troy, 148 F.3d 52 (2d Cir. 1998)
  • Schallop v. NYS Dept. of Law, 20 F. Supp. 2d 384 (NDNY 1998)
  • Sagendorf-Teal v. County of Rensselaer, 100 F.3d 270 (2d Cir. 1996)
  • Kelly v. New York State Executive Dept., 203 AD2d 886 (3d Dept. 1994)
  • Serio v. New York State Dept. of Correctional Svcs., 200 AD2d 885 (3d Dept. 1994)
Who We Are
GDWO is committed to providing excellence in legal representation.

Located in New York's capital – Albany, our highly skilled and experienced attorneys are admitted to all state and federal courts in New York, as well as Connecticut, and the United States Supreme Court. We have the experience, knowledge and integrity to represent our clients in a competent, vigorous and professional manner.

Client success is our mission.