 He moved to UC Berkeley in 1958 as professor of engineering science, and played an important role in the establishment of the Division of Applied Mechanics in the Department of Mechanical Engineering here.From 1964 to 1969, he served as chairman of the division.From 1991 onwards, he held the Roscoe and Elizabeth Hughes Chair in Mechanical Engineering, and in 1994 he was advanced to the newly instituted position of professor in the graduate school.