 From 1972 to 1984, he served on the U.S. National Committee on Theoretical and Applied Mechanics, and was chairman of the Committee in 1979-1980.During the period 1978-1984, he was a member of the General Assembly of the International Union of Theoretical and Applied Mechanics.His last appointment was to the ASME Committee on Honors (1986–1994), of which he was chairman from 1991 to 1994.