David R. Weir is Research Professor in the Survey Research Center of the Institute for Social Research at the University of Michigan, and Director of the NIA-funded Health and Retirement Study. Prior to joining ISR, he was Visiting Associate Professor in the Department of Economics and Research Associate in the Harris School of Public Policy at the University of Chicago, and the recipient of a Special Emphasis Research Career Award in the Economics and Demography of Aging from the National Institute on Aging.