He is also associate editor at the Review of Economic Dynamics and a co-editor of the Journal of Development Economics. He received his PhD in economics from UCLA. He previously held positions at the Federal Reserve Bank of Minneapolis as well as Arizona State University, and is currently a research affiliate with the Economic Fluctuations and Growth Group at the National Bureau of Economic Research. His research focuses on macroeconomic and growth theory. Much of his recent work examines productivity, particularly as it relates to agriculture and developing economies, as well as human capital.