Professor Hummels’ teaching interest is in international economics. His research focuses on empirical investigations in international trade, with a special emphasis on product differentiation, barriers to trade, and the effects of transportation and infrastructure on trade and economic development. Professor Hummels’ major publications include "International Transportation Costs and Trade in the Second Era of Globalization". Journal of Economic Perspectives (2007); “The Variety and Quality of a Nation’s Exports,” American Economic Review (2005); “Shipping the Good Apples Out? An Empirical Confirmation of the Alchian Allen Conjecture,” Journal of Political Economy (2004); “Intra-national Home Bias: Some Explanations,” Review of Economics and Statistics, (2003); “The Nature and Growth of Vertical Specialization in World Trade,” Journal of International Economics, (2001); and “Monopolistic Competition and International Trade: Reconsidering the Evidence” Quarterly Journal of Economics, (1995). Professor Hummels is a Research Associate of the National Bureau of Economic Research, an Associate Editor of the Journal of International Economics, and an Associate Director of the Forum for Research on Empirical International Trade. He has worked as a consultant for and visiting scholar at a wide variety of central banks, development banks and policy institutes around the world. He previously worked as an assistant professor of economics at the University of Chicago’s Graduate School of Business.