BA, San Jose State University, US; MA, California State University, US; PhD, University of Chicago, US. Formerly, Visiting Professor: Makerere University, Uganda; University of Dar-es-Salaam, Tanzania. Since 1989, with University of Pennsylvania. Host, The History Detectives, Public Broadcasting System. Chairman, Department of Sociology, University of Pennsylvania. Director, Centre for African Studies, University of Pennsylvania. Author.