Robert Moffitt is the Krieger-Eisenhower Professor of Economics at Johns Hopkins University, where he has worked since 1995. He also holds a joint appointment at the Johns Hopkins Bloomberg School of Public Health. His research interests are in the areas of labor economics and applied microeconometrics, with a special focus on the economics of issues relating to the low-income population in the U.S.. A large portion of his research in labor economics has concerned the labor supply decisions of single mothers and their responses to the U.S. welfare system. He has also conducted research on the effects of social insurance programs, including Social Security, unemployment insurance, and disability insurance, as well as of the U.S. income tax system. Another major area of his research concerns trends in volatility in the U.S. labor market and trends in the labor force attachment of men and women. He has served as Chief Editor of the American Economic Review, Coeditor of the Review of Economics and Statistics, and Chief Editor of the Journal of Human Resources.