A. B. Harvard 1959

A. M. Princeton 1960

Ph. D. Princeton 1961

Postdoc, Oxford University, 1961-62

C. L. E. Moore Instructor, M. I. T., 1962-63

Assistant Professor, University of Chicago, 1963-66

Associate Professor, University of Chicago, 1966-70

Professor, University of Chicago, 1970-

Member, Institute for Advanced Study, 1969, 1979, 1983

Guggenheim Fellow, 1974-75

Visiting Professor, University of California at Berkeley, 1981

Visiting Fellow, All Souls College, Oxford, 1981

Visiting Professor, University of Paris VII, 1982

Member, Mathematical Sciences Research Institute, 1990

Invited Lecture Series, London Mathematical Society, 1997

Cantrell Lecturer, University of Georgia, 2002