David T. Ellwood is the Scott M. Black Professor of Political Economy at the John F. Kennedy School of Government at Harvard University. He joined the Kennedy faculty in 1980 and served as dean from 2004 to 2015. Previously, he served as assistant secretary for planning and evaluation in the U.S. Department of Health and Human Services, and he was co-chair of President Clinton's initial efforts on welfare reform.
Ellwood is a labor economist who specializes in poverty and welfare, family change, and wage inequality. He is the author of numerous books and articles that have significantly influenced public policy in the United States and other countries. His book Poor Support: Poverty in the American Family was selected by The New York Times Book Review as one of the most notable books of 1988, and by the Policy Studies Organization as the outstanding book of 1988.