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the site principal investigator for the U.S. Women's Health Initiative (WHI), a national intervention trial exploring the prevention of breast and colon cancer and coronary disease, and is the deputy chair of WHI's Executive Committee.

Robert J. Willis, a professor of economics, joined the University of Michigan in 1995 and holds joint appointments with the Survey Research Center at the Institute for Social Research and the Population Studies Center. Before coming to Michigan, Dr. Willis held appointments at the University of Chicago, the State University of New York at Stony Brook, and Stanford University. He has been elected to the Board of Directors of the Population Association of America; has served on advisory boards for a number of surveys, including the Panel Study of Income Dynamics, the High School and Beyond Survey, and the Health and Retirement Survey; and was recently appointed as representative to the Census Advisory Board by the American Economic Association. Dr. Willis received his Ph.D. from the University of Washington in 1971.

David Wise is John F. Stambaugh Professor of Political Economy at the John F. Kennedy School of Government, Harvard University, and the director for Health and Retirement Programs at the National Bureau of Economic Research. He has written extensively on individual savings, pensions, and assets in later life, and has authored or edited numerous books and papers on the economics of aging. Dr. Wise recently finished a multiyear 11-country collaborative study of social security programs and retirement around the world.

Zeng Yi currently is senior research scientist at the Center for Demographic Studies of Duke University, with joint appointments as professor of demography at the Institute of Population Research, Peking University, and as distinguished research scholar at the Max Planck Institute for Demographic Research, Rostok, Germany. Previously, he was director of the Institute of Population Research at Peking University. His primary research fields are population aging and family household dynamics. Dr. Zeng has authored or edited nine books and nearly 100 professional papers, about half of which are in English and published in academic journals or series in the United States, England, the Netherlands, Belgium, Austria, Denmark, and Italy. He received his Ph.D. from Brussels Free University in 1986 and conducted postdoctoral research at Princeton University.

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