Joshua B. Gruner, Partner

Joshua B. Gruner,  Partner

Education: University of Delaware, B.A., Political Science, 1997, Hofstra University, J.D., 2000

Practice Areas: Matrimonial Law; Family Law; Civil Litigation

Membership: Nassau County and New York State Bar Associations

Admissions: 2001, New York

Reported Cases:

  • Ehrman v. Ehrman, 67 A.D.3d 955, 889 NYS2d 652 (2nd Dept., 2009)
  • MI.S. v. MA.S.,  New York Law Journal, March 17, 2014
  • Anonymous 2017-1 vs. Anonymous 2017-2, 2018 NY Slip Op 28337 (October 23, 2018)


Joshua B. Gruner graduated with a Bachelor of Arts in Political Science from the University of Delaware in 1997 and received an Advanced Honors Certificate upon graduation. While at the University of Delaware, he founded the school’s Pre-Law Society.

Mr. Gruner attended Hofstra University School of Law from 1997-2000.  He served as the Managing Editor of the Family & Conciliation Courts Review (now known as the Family Courts Review).  Before graduating in 2000, Mr. Gruner participated in the NITA Trial Advocacy Program, assisted in the creation of a Family Law Clinic and interned for Nassau Supreme Court Justice Gabriel Kohn.  Upon graduating, he received the Distinguished Service to the School Award for all of his contributions to the school, particularly in the areas of family law.

Mr. Gruner was admitted to practice law in New York in January, 2001.  After graduating, he immediately began working in various areas of law, including real estate, corporate litigation and all phases of matrimonial and family law.  In 2005, he became an associate at the firm of Gassman & Keidel (predecessor to Gassman Baiamonte Gruner, P.C.) and since that time has focused exclusively in the fields of matrimonial and family law.  Mr. Gruner became a partner of the firm on October 1, 2015.

He is currently a member of the Nassau County Bar Association, where he was appointed as a member of the Judiciary Committee and WE CARE Advisory Board, and the New York State Bar Association, where he was appointed Co-Chair of the Membership and Long Range Planning Committees.  Mr. Gruner co-authored the New York Lawyers’ Practical Skills Series for Matrimonial Law, published by the New York State Bar Association.  For many years, he has been asked to assist in teaching the Family Law with Skills course offered at Hofstra University School of Law.  He completed the intensive week long trial program offered by the National Family Law Trial Institute.  Mr. Gruner has been recognized nationally and state-wide as a family law attorney by the American Institute of Family Law Attorneys (2014 & 2015, Under 40 Client Satisfaction Award), National Academy of Family Law Attorneys (2014 Top 10 Under 40), N.Y. “Super Lawyers” (2013 Rising Star), and New York Metro’s Top Lawyers (Rising Star 2015).

Mr. Gruner was born and raised in Rockville Centre, NY, where he currently resides with his wife and two sons.

Joshua was just added to the Ten Leaders in Matrimonial Law Under 45 on Long Island list.

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