David Weil is Professor of Economics at Brown University. Weil has written widely on various aspects of economic growth, including the empirical determinants of income differences among countries, the accumulation of physical capital, international technology transfer, and population growth. He has also written on assorted topics in demographic economics including population aging, Social Security, the gender wage gap, retirement, and the relation between demographics and house prices. His current work examines how differences in health contribute to income gaps among countries. He recently published an undergraduate textbook on economic growth.