JESÚS FERNÁNDEZ-VILLAVERDE is currently a professor of economics at the University of Pennsylvania, where he serves as director of Graduate Studies in the Economics Department, a visiting scholar at the Federal Reserve Banks of Chicago and Philadelphia, and member of the National Bureau of Economic Research and the Center for Economic Policy Research. In the past he has held academic appointments, among others, at Princeton University, Yale University, Duke University, and New York University; he has been a visiting scholar at the Federal Reserve Banks of St. Louis, Minneapolis, Cleveland, and Atlanta; a national fellow of the Hoover Institution at Stanford University; a visiting scholar at the Becker-Friedman Institute of the University of Chicago; a visiting scholar at INET Cambridge; and the director of the Penn Institute for Economic Research. He is editor of the International Economic Review and has served in the editorial board of several other learned journals. He is also the editor of NadaEsGratis, the leading blog about economics in Spanish. He has published more than two dozen peer-reviewed papers, including in the American Economic Review, Econometrica, and Review of Economic Studies, and edited and coauthored several books.