 Bush, while meanwhile heading a 300-person task force charged with locating and assisting Americans caught in China when the protests turned violent.For seven years following his 1994 retirement from the Foreign Service, Williams taught graduate level China-related courses at Columbia and New York Universities.Williams graduated from the University of Chicago (A.B., 1948), Purdue University (B.S., 1951), and Harvard University (M.B.A., 1953).