Instructor, Texas Southern University (1955-1957)
Instructor, Howard University (1957-1964)
Textbook Editor (1966-1968)
Book Editor, Random House (1968-1983)
Instructor, University of Albany, State University of New York (1984-1989)
Obert C. Tanner Lecturer, University of Michigan, Ann Arbor (1988)
Jeannette K. Watson Distinguished Professor, Syracuse University (1988)
Instructor, Princeton University (1989-2006)