Divorce Lawyers for High-Net-Worth Clients Across Nassau County

Sophisticated Counsel for Divorce in Nassau County

Serving Business Owners, Professionals, and Complex Financial Estates

Gassman Baiamonte Gruner PC focuses exclusively on matrimonial and family law, representing clients throughout Nassau County who require discretion, legal precision, and deep experience. From multi-million-dollar estates to business ownership issues, our team brings structure to even the most complicated divorces.



Our office is centrally located in Garden City, steps from the Nassau County courthouses. We appear regularly in Nassau Supreme Court and Family Court on behalf of clients from across the county.

Why Clients Choose Our Firm in Nassau County

Trial-Ready When Necessary, Resolution-Driven When Possible

With a decades-long track record of results in litigation and settlement, our firm is known in Nassau’s legal community for its courtroom credibility. We prepare every case to be trial-ready while exploring smart, timely settlements when they serve the client’s interests.



We’re often retained in cases involving forensic accounting, contested custody, business valuation, and post-judgment modifications.

Local Knowledge, Regional Reach

Serving Clients Throughout Nassau County

We represent clients in:


  • Great Neck
  • Manhasset
  • Roslyn
  • Rockville Centre
  • Garden City
  • Port Washington
  • Merrick
  • Syosset
  • Plainview
  • Oyster Bay



Our attorneys are active in the Nassau County Bar Association and recognized for leadership within the legal profession.