He will be in residence at IRP from March 3 through March 14, 2008. On March 6, he will present a seminar at IRP. He received his Ph.D. from the University of California, Los Angeles. His interests include labor economics, applied econometrics, and applied microeconomics. His recent research has focused primarily on the determinants and effects of policies oriented to help welfare recipients (and low-income individuals in general) to become self-sufficient, and on the econometric methods for program evaluation. A recent publication is "Nonparametric Tests for Treatment Effect Heterogeneity," with R. K. Crump, V. J. Hotz, & G. W. Imbens, 2007, forthcoming in The Review of Economics and Statistics.