Stephen Gassman, Partner

Stephen Gassman, Partner

Education: University of North Carolina at Chapel Hill, B.A., 1967, New York Law School, J.D., 1971

Practice Areas: Matrimonial Law; Family Law; Litigation; Appellate Practice

Membership: Nassau County (President, 1988-1989) and New York State (Chair, Family Law Section, 1992-1994) Bar Associations.

Admissions: 1972, New York

Reported Cases: DeMille v. DeMille, 5AD3d 428, 774 NYS2d 156 (2d Dept., 2004); Matter of Brim v. Combs, 25 AD3d 691, 808 NYS2d, 735 (2d Dept., 2006).


Stephen Gassman is the senior partner in the firm of Gassman Baiamonte Gruner, P.C., Garden City, N.Y. which limits its practice to matrimonial and family law. He is a graduate of the University of North Carolina and New York Law School.

Mr. Gassman is a Fellow of the American Academy of Matrimonial Lawyers; has served as President of the Bar Association of Nassau County, New York andChair of the Family Law Section of the New York State Bar Association.He is a member of the statewide Matrimonial Practice and Rules Committee of the Unified Court System of the State of New York. He has also served asChair of the Matrimonial & Family Law Committee of the Nassau County Bar Association, as President of the Nassau County Bar Association, and as an Adjunct Professor of Law atTouro Law School, teaching Advanced Family Law. Mr. Gassman has also served as a member of the Judicial Hearing Officer Screening Committee for the Second Judicial Department, a member of the Advisory Board of the Safe Center, and a member of the Law Guardian Advisory Committee for the Tenth Judicial District.

Mr. Gassman has co-authored with Evidence for Matrimonial Lawyers and Matrimonial Valuation, and has authored a book entitled Cross Examination: A Primer for the Family Lawyer. He has also co-authored with RosaliaBaiamonte the “Library of New York Matrimonial Law Forms”, published by the New York Law Journal Press.

He has been a lecturer at matrimonial law seminars and symposiums conducted under the aegis of the New York State Bar Association, American Academy of Matrimonial Lawyers, "New York Law Journal", NYS Bar Association, American Bar Association, Nassau County Bar Association, Suffolk County Bar Association, Kings County Bar Association, Office of Court Administration - Judicial Seminars, Westchester County Bar Association, Appellate Division Second Department, Association of the Bar of the City of New York, New York County Lawyers Association, Matlaw Systems, New York State Trial Lawyers Association, Family Court Law Guardian Seminars - Tenth Judicial District; and numerous other bar groups.               

Stephen Gassman has been listed in The Best Lawyers in America for over 30 years, and has been listed in New York Super Lawyers since its inception in 2007. He has been a guest and moderated television shows dealing with matrimonial law on Court TV and Lawline.

Additionally, Mr. Gassman has had bestowed upon him the award of “Distinguished Past President” by the Nassau County Bar Association, and the award as an “Education Partner” by Nassau Boces.

Mr. Gassman is the founder of the We Care Fund, the charitable arm of the Nassau County Bar Association, and was the first recipient of the award honoring extraordinary service to this charity, the award known as the Stephen Gassman Award.

Mr. Gassman is married and has three children and four grandchildren.

On January 10, 2017, Martindale-Hubbell confirmed that Mr. Gassman still maintains the AV Preeminent Rating, Martindale-Hubbell's highest possible rating for both ethical standards and legal ability, even after first achieving this rating in 1981. This rating represents the pinnacle of professional excellence. It is achieved only after an attorney has been reviewed and recommended by their peers - members of the bar and the judiciary.

Stephen continues to be one of the Ten Leaders in Matrimonial Law on Long Island.

On May 11, 2019, Stephen Gassman will be honored as the recipient of the Nassau County Bar Association’s Distinguished Service Medallion, the Association’s highest honor which is awarded to an individual for service that has enhanced the reputation and dignity of the legal profession.

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