He also holds a courtesy appointment in the Stanford Graduate School of Business. His research interests include statistical methods, political economy, and political behavior. His research has appeared in journals such as the American Political Science Review, American Journal of Political Science, Journal of the American Statistical Association, Review of Economics and Statistics, Political Analysis, International Organization, and the Journal of Statistical Software, and has received awards from the American Political Science Association, the Society of Political Methodology, the Midwest Political Science Association.