Ambassador to Brazil under JFK and LBJ; Assistant Secretary of State for Inter-American Affairs; U.S. Coordinator for Alliance for Progress, 1967; 1940s and 1950s Mutual Security Agency; Atomic Energy Commission, 1946; Bernard Baruch; Marshall Plan; 1947-1949 Paris with Governor Harriman; with Harriman in DC in 1950; 1952 for Truman; London as Chief of AID; Minister of Economic Affairs in Embassy in 1952, 1955; Alliance for Progress; to Brazil in 1961; Dominican affair; OAS Charter; Assistant Secretary of Latin America 1967; leaving government for Johns Hopkins University in 1967