1. Professor of Economics, University of California at Davis, Davis, California; Research Associate, National Bureau of Economic Research, Cambridge, Massachusetts.
2. Associate Professor of Economics, University of California at Davis, Davis, California; Faculty Research Fellow, National Bureau of Economic Research, Cambridge, Massachusetts; Visiting Research Scholar, Center for Health and Wellbeing, Princeton University, Princeton, New Jersey.
3. Assistant Professor at the University of Arizona, Tucson, Arizona.