With Office of Strategic Services, 1942-1945, Department State, 1945-1946. Visiting assistant professor Chinese, University of Chicago, 1946-1947, assistant professor, 1947-1953, associate professor Chinese literature and instns., 1953-1960, professor, 1960-1973, professor emeritus, 1973-1976, Chairman of Commission on Far Eastern civilizations, 1957-1963, director Far Eastern Language and Area Center, 1959-1963, 69-71, member of council of Senate, 1959-1962, Chairman of Commission on Far Eastern studies, 1970-1971, chairman Far Eastern Program in College, 1970-1971. Member visiting committee for East Asian studies Harvard, 1960-1966.
Member advising committee on Chinese and Japanese studies Evanston Township High School, 1963-1966. Adviser East Asian Studies Program, U. Miami, 1966, Michigan State University, 1967.