 He was chief of the Manuscript Division (1963–1964), director of the Historical Branch (1964–1965), Assistant Dominion Archivist (1965–1968) and Acting Dominion Archivist (1968–1970).From 1970 to 1984, he was Dominion Archivist.He was President of the Society of American Archivists from 1972 to 1973.