Cox, Hugh was born on September 3, 1905 in Logan, Iowa, United States. Son of William Riley and Caroline (Reel) Cox.
Bachelor of Arts, Univercity Nebraska, 1926. Bachelor of Arts, Christ Church, Oxford (England) University, 1929, Bachelor of Civil Law, 1930.
Admitted to New York bar, 1933, lawyer with Root, Clark, Buckner & Ballantine, New York, 1930-1935. Special assistant to attorney general, 1935-1943. Counsel for Department of Justice before Temporary National Economics Committee, 1938-1939.
Assistant attorney general, 1943, assistant solicitor general, 1943-1945. General counsel Surplus Property Administration, 1945. Practicing law, member firm Cleary, Gottlieb, Friendly & Cox, 1946, Covington & Burling, 1951.
Director Chesapeake & Potomac Telephone Сompany.
Member Phi Beta Kappa. Clubs: Cosmos, Metropolitan (Washington).