biometry, an M.S. in human nutrition, and a Ph.D. in biometry, all from Cornell University.

PAUL W. HOLLAND holds the Frederic M. Lord chair in measurement and statistics at the Educational Testing Service (ETS). His association with ETS began in 1975 as director of the Research Statistics Group, and in 1986 he was appointed its first distinguished research scientist. He left ETS in 1993 to join the faculty at University of California, Berkeley, as a professor in the Graduate School of Education and Department of Statistics but returned in 2000 to his current position at ETS. His research interests include psychometrics, causal inference of educational interventions in nonexperimental studies, discrete multivariate data analysis, and the analysis of social networks. He was designated a national associate of the National Research Council in 2002. He has an M.A. and a Ph.D. in statistics 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

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