Academic Appointment, Affiliation, and Employment History Tenure Track Appointments Professor, University of Southern California, 08/01/1983- Director, Caltech-USC Center for Theoretical Physics, 09/01/1999-08/01/2003 Associate Professor, Yale University, 07/01/1979-08/01/1983 Assistant Professor, Yale University, 09/01/1975-06/01/1979 Assistant Professor, Stanford University, 09/01/1973-08/31/1975 Visiting and Temporary Appointments Visiting Professor, Perimeter Institute for Theoretical Physics, 12/01/2010-05/31/2011 Visiting Professor, Princeton University, 10/01/2010-11/30/2010 Scientific Associate, CERN Theory Division, Switzerland, 08/01/1996-08/01/1997 Member, Institute for Advanced Study, Princeton, 01/01/1990-05/01/1990 Visiting Professor, University of California, Santa Barbara, 08/01/1986-12/01/1986 Member, Institute for Advanced Study, Princeton, 01/01/1980-06/01/1980 Visiting Assistant Professor, Harvard University, 09/01/1978-12/31/1978 PostDoctoral Appointments Assistant Reserarch Physicist, University of California, Berkeley, 09/01/1971-08/31/1973