In this capacity, he conducts research on statistical methods for program and policy evaluation. He has lectured and taught globally on statistical techniques for program evaluation and comparative effectiveness. He has experience not only in the practice of program evaluation, but also in the development of new statistical techniques for use in evaluating policy interventions. He received his Ph.D from the University of North Carolina at Chapel Hill and was a post-doctoral research fellow at Nuffield College, Oxford University. He has published in Journal of the Royal Statistical Society, Series A, the American Journal of Political Science, the American Political Science Review, and Statistical Science.