Bartley J. Costello III is a member of the Firm’s Government Relations and Education departments. During his career he has chaired the firm’s Litigation and Labor departments. He represents several clients before the New York State Legislature, Governor’s Office and state regulatory agencies. He also specializes in Board governance issues for not-for-profit corporations.

Key clients include the New York State Ophthalmological Society, the Association of Proprietary Colleges, the New York Institute of Special Education, statewide Associations for schools serving the blind and visually impaired students (4201 Schools Association) and schools serving juveniles with special needs (853 Schools Association) as well as the Council of Family and Child Caring Agencies (COFCCA) and the United Way of New York State.

He served as lead counsel before the New York State Court of Appeals in a trilogy of primary cases involving governmental authority which: limited the use of executive power by the Governor; established boundaries for state agency authority and curtailed the State Comptroller’s jurisdiction. In addition, Mr. Costello served as counsel in litigation before the United States Supreme Court that upheld the New York State hospital reimbursement system, reversing lower court rulings.

Mr. Costello has been Martindale-Hubbell “AV” rated for over 25 years.

Mr. Costello is Chairman of the Board of the USS Slater and also serves on the Board of Directors of The Next Step, Inc., an addiction recovery home for women. In addition, he serves as executive committee member with the Boards of the Government Law Center at Albany Law School. He is a Fellow at the New York Bar Foundation, and has served as the Board Chair for the LaSalle School for Boys.


  • B.A., College of the Holy Cross 1966
  • J.D., Albany Law School 1972

Bar Admissions

  • New York
  • United States District Courts: Northern, Southern and Eastern Districts
  • United States Court of Appeals: Second Circuit
  • United States Supreme Court