mathematics from Davidson College (1971), a B.Phil. in economics from Oxford University (1973), and a Ph.D. in economics from Princeton University (1975). He is a research associate of the National Bureau of Economic Research and a member of the board of directors of the Population Association of American and the Alan Guttmacher Institute.

KOFI AWUSABO-ASARE is a senior lecturer in population and medical geography at the University of Cape Coast, Ghana. His research interests are in population policy formulation and implementation and the social dimensions of HIV/AIDS infection. His work in HIV/AIDS is part of the West African Research Network on Sexual Networking. He participated in the Ghana segment of the Agenda for Improving the Implementation of Population Programs in Africa in the early 1990s. He is currently a member of the Technical Committee on Population Policy of the Ghana National Population Council. He has a B.A. from the University of Cape Coast, an M.A. in demography from the Australian National University in Canberra, and a Ph.D. from the University of Liverpool.

JOHN G. CLELAND is professor of medical demography at the London School of Hygiene and Tropical Medicine. He has long-standing interests in fertility, family planning, and child survival in developing countries and has published widely on these subjects. He recently assisted the Global Programme on AIDS at the World Health Organization (WHO) in the design and analysis of surveys on sexual behavior and coedited a book on the main results. He currently serves on committees of WHO's Human Reproduction Programme, of Macro International's Demographic and Health Surveys Programme, and of the International Union for the Scientific Study of Population.

BARNEY COHEN is study director of the Panel on Data and Research Priorities for Arresting AIDS in Sub-Saharan Africa. Since 1992 he has served as program officer with the Committee on Population of the National Research Council/National Academy of Sciences, working on a variety of projects on adolescent fertility and overall population dynamics in sub-Saharan Africa, the demography of Senegal, the demography of North American Indians, and the relationship between infant and child mortality and fertility. Between 1982 and 1986 he lived and worked in The Sudan, and he has authored or coauthored a number of scientific papers on the functioning of urban labor markets in Khartoum. He has a B.Sc. (hons.) in pure mathematics and statistics from the University College of Wales (1980), an M.A. in economics from the University of Delaware (1987), and a Ph.D. in demography from the University of California, Berkeley (1991).

CARL KENDALL is associate professor in the Department of International Health and Development and director of the HIV/AIDS Track at the Tulane University School of Public Health and Tropical Medicine; he is also adjunct

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