Mary Ellen Williams

US Court of Federal Claims

Contact Details

US Court of Federal Claims


Since her appointment in 2003, Judge Mary Ellen Coster Williams has served on the United States Court of Federal Claims in Washington, D.C.  From 1989 to 2003, she served as an administrative judge on the General Services Board of Contract Appeals.  During her combined 29 years on the bench, Judge Williams has handled wide-ranging civil matters including government contract disputes, Fifth Amendment taking claims, and patent infringement actions against Government agencies. 


Born and raised in New York, Judge Williams received a B.A. in Latin and Greek and an M.A. in Latin from the Catholic University of America before attending Duke Law School.  Following graduation from Duke Law, Judge Williams started her career in private practice as a civil litigator before serving as an Assistant United States Attorney.  Throughout her career, Judge Williams has been active in bar associations, serving on the Board of Governors of the American Bar Association, as chair of the ABA’s Section of Public Contract Law and in the ABA House of Delegates.  Judge Williams has served as the Foundation President, a Trustee, and a member of the Board of Directors for the Bar Association of the District of Columbia.  She is a former Chair of the D.C. Young Lawyers Section and Secretary of the D.C. Bar. 


Judge Williams recently taught courses in litigation with the federal government, government contracts, remedies and intellectual property at local law schools and Johns Hopkins University’s Advanced Academic Program for Law and Government.








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