William M. Kelleher

Director
William  M. Kelleher

WILLIAM M. KELLEHER is a Director at the firm. He concentrates his practice in fiduciary litigation—especially trust litigation—in the Delaware Court of Chancery, the nation’s premier forum for the resolution of complex trust disputes. He has taken to trial many high-profile trust matters in that court. Bill also counsels trust companies on fiduciary duties and related issues.

Immediately upon graduation from law school, Bill spent four years on active duty as a judge advocate general in the United States Coast Guard. Thereafter he was a judicial law clerk at the Delaware Court of Chancery working for both Chancellor William B. Chandler, III and then-Vice Chancellor (later Chief Justice) Myron T. Steele.

Bill also previously served as a Deputy Attorney General for the State of Delaware. He has argued twelve times at the Delaware Supreme Court.

Areas of Practice

Admissions

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Honors & Awards

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Recent News

  • 04.10.26

Bill Kelleher, a director at Gordon, Fournaris & Mammarella, P.A., has been elected as a Fellow of the American Bar Foundation (“ABF”). ABF Fellows are a global honorary society of attorneys, judges, law faculty, and legal scholars whose public and private careers have demonstrated READ MORE

Bill Kelleher Named American Bar Foundation Fellow
  • 03.11.26

Bill Kelleher and Christina Smith wrote the article titled Bloodlines, Beneficiaries, and the Black Stuff: How Sir Benjamin Guinness’s Estate Plan Preserved a Dynasty—and What It Teaches Us About Modern Succession Law, which was published in the March/April 2026 Edition of the ABA Probate & READ MORE

  • 11.11.25

IMO Estate of Reginald E. Watson, Sr., C.A. No. 2025-0063-DG (October 28, 2025) In a recent opinion from the Delaware Court of Chancery, Magistrate in Chancery Danielle Gibbs recommended that the personal representative of the Estate of Reginald E. Watson, Sr. (the “Estate”) be required to READ MORE

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