from Stanford University (1966) and a B.A. in mathematics from the University of Michigan (1962).

MICHAEL D. HURD is a senior economist and the director for the RAND Center for the Study of Aging. His expertise concerns aging and the elderly; savings, wealth, and retirement; and U.S. labor markets and social security. Previously he chaired the Department of Economics at the State University of New York at Stony Brook. He was a visiting senior scientist at the Institute for Social Research at the University of Michigan and a visiting associate professor of economics at Stanford University. He is a member of the Behavior and Sociology of Aging Review Subcommittee at the National Institutes of Health. He is also a member of the Scientific Committee of the Center for Research on Pensions and Welfare Policies at the University of Turin, Italy. He is a consultant to the English Longitudinal Study of Aging and a consultant to the Survey on Health, Aging, and Retirement in Europe. He has a Ph.D. in economics from the University of California, Berkeley.

HELEN H. JENSEN is professor of economics and head of the Center for Agricultural and Rural Development’s food and nutrition policy research division at Iowa State University. Her research addresses food assistance and nutrition policies, food security and the economics of food safety and food hazard control options. She is on the editorial boards of Agricultural Economics, Food Economics, and Agribusiness: An International Journal and was elected chair of the Food Safety and Nutrition Section of the American Agricultural Economics Association. She is currently serving on the Institute of Medicine’s Committee to Review the WIC Food Packages and the National Research Council’s Committee on Assessing the Nation’s Framework for Addressing Animal Diseases. She has been a member of the National Research Council’s panel on animal health and food safety and expert panels related to food safety, food insecurity and hunger, and food programs. She has a Ph.D. in agricultural economics from the University of Wisconsin-Madison.

NANCY MATHIOWETZ is associate professor of sociology at the University of Wisconsin-Milwaukee. She was previously an associate professor at the University of Maryland’s Joint Program in Survey Methodology. Her research interests include the assessment and reduction of measurement error in surveys and the use of survey data in the development of public policy. She is co-editor of Survey Measurement of Work Disability: Summary of a Workshop, one of the reports of the Committee to Review the Social Security Administration’s Disability Decision Process Research, a joint project of the Institute of Medicine and the National Research Council. She serves as associate editor of Public Opinion Quarterly and the Jour-

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