David N. Weil is James and Merryl Tisch Professor of Economics at Brown University, director of the James M. and Cathleen D. Stone Wealth and Income Inequality Project at Brown, and a research associate of the National Bureau of Economic Research. Weil has written widely on various aspects of economic growth, including the empirical determinants of income variation among countries, the contribution of health improvements to growth, the geographic determinants of development, the measurement of income inequality, the accumulation of physical capital, international technology transfer, population growth, and the use of satellite observation as a measurement tool. His textbook on growth has been translated into six languages. He has also written on assorted topics in demographic and health economics including the economic impacts of malaria and salt iodization, population aging, Social Security, the gender wage gap, retirement, and the relationship between demographics and house prices. He received his Ph.D. from Harvard University in 1990.