sentences:  He subsequently returned to Yale in 1959, then went to Stanford University in 1963, where he remained until his retirement in 1993.He was elected a Fellow of the American Academy of Arts and Sciences in 1961.He was chair of the political science department at Stanford from 1964 to 1969 and spent time as a visiting professor at the University of Tokyo, the University of Belo Horizonte, and the Taras Shevchenko National University of Kyiv.