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.

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Honors & Awards

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Recent News

  • 07.23.26

Gordon, Fournaris & Mammarella, P.A. (GF&M) has again earned Chambers’ highest ranking—Band 1 in Private Wealth Law: Delaware—in the 2026 edition of the Chambers High Net Worth (HNW) Guide. The firm also received a Band 2 ranking in Private Wealth Disputes: Delaware. Chambers READ MORE

  • 07.17.26

Estate of Martha Barotz v. Wilmington Savings Fund Society, FSB; Wells Fargo Delaware Trust Company, N.A.; Wells Fargo Bank, N.A.; Apollo Global Management, Inc.; Apollo Asset Management, Inc.; Apollo Capital Management, L.P.; and Financial Credit Investment I Manager, LLC, C.A. No. 2024-0447-JTL READ MORE

  • 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
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