2010- Nonresident Fellow, Resources for the Future, Washington, D.C.

2006- Research Professor & Professor Emeritus of Economics, University of California at Irvine

 

1986-2005 Professor of Economics, University of California at Irvine

 

1983-86 Associate Professor of Economics, University of California at Irvine

 

1976-83 Assistant Professor of Economics, Princeton University

 

1972 Intern, President's Council on Environmental Quality

 

1971-76 Teaching and Research Assistant positions, University of California, Berkeley

 

1969-70 Research Assistant, Dept. of Environmental Medicine, Johns Hopkins University