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<unk> <unk> <unk> After the war he earned M.A. (1947) and PhD (1949) degrees at Harvard, where he was a student of John K. Fairbank. He was a member of the Harvard Society of Fellows.<unk> He was a member of the Harvard Society of Fellows. He taught at the University of California, Berkeley, from 1951 until his death. ️<unk>️<unk>️<unk>️<unk>️