He joined the Department of External Affairs in 1941.
He joined the Department of External Affairs in 1934 eventually becoming Canada ’ s ambassador to West Germany ( 1954-1958 ), Permanent Representative to the United Nations ( 1958-1962 ), ambassador to the United States during the presidencies of John F. Kennedy and Lyndon Johnson ( 1962-1966 ), ambassador to the North Atlantic Council ( 1966-1967 ) and from 1967 to 1971 was Canadian High Commissioner to the United Kingdom in London.
He joined the Department of External Affairs in 1941, served as senior adviser to Canadian members of the International Control Commission in Vietnam in 1954, and became the legal advisor to the Department of External Affairs in 1956.
He joined the Department of External Affairs in 1947.
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