Matthew Riordan practices primarily in the New York State Surrogate's Court on trust and estate litigation matters, although he also handles commercial litigation matters in New York State Supreme Court. As a regular part of his practice, Mr. Riordan handles will contests, construction proceedings, contested accountings, and other trust and estate related litigation matters. Mr. Riordan has also litigated a wide variety of commercial matters both in New York State court and the federal courts, often arising from commercial disputes to which a fiduciary is a party. His experience includes all phases of litigation, including trials and appeals.

Before attending law school, Mr. Riordan served at the White House, where he worked in the White House Office on Environmental Policy as a Special Assistant for Political Affairs. Mr. Riordan spent the summer after his first year of law school working in Australia for a member of the Australian Parliament. Before becoming a lawyer, he spent time working as a commercial fisherman in Alaska.

Admitted to practice in New York in 1999, Mr. Riordan is also admitted to practice in Connecticut, Massachusetts, Rhode Island and the District of Columbia.


  • Numerous will contests concerning issues of capacity, execution, fraud, and undue influence
  • Contested accountings
  • Proceedings to surcharge a fiduciary
  • Proceedings for the removal of a fiduciary
  • Proceedings to compel distributions
  • Creditor claims against estates
  • Probate proceedings
  • Estate administrations


  • JD, Indiana University Maurer School of Law, 1998
  • BA, English, Tufts University, 1992
  • New York
  • Connecticut
  • District of Columbia
  • Rhode Island
  • US District Court, Southern District of New York
  • US District Court, Eastern District of New York
  • US District Court, District of Connecticut
  • US District Court, District of Rhode Island
  • Member, Trusts and Estates Section, New York State Bar Association

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