Fellow of the American Statistical Association and the American Association for the Advancement of Science, and a member of the Biometrics Society and the Society for Epidemiological Research.

Gerben DeJong, Ph.D., is Director of the National Rehabilitation Hospital Research Center and Professor of Family Medicine and Adjunct Professor at the Georgetown University Institute of Public Policy. Prior to coming to Washington, D.C., he served as Associate Professor in Rehabilitation Medicine at the Tufts University School of Medicine. Dr. DeJong has a special interest in managed care's impact on medical rehabilitation-people with disabilities and other vulnerable populations; health outcomes measurement, and medical ethics. He is probably best known for his seminal work on disability and health policy and the independent living movement. Dr. DeJong was a Fulbright Scholar in the Netherlands on the research staff of the Social Security Council. He is a member of the American Congress of Rehabilitation Medicine, the Association for Health Services Research, and the National Academy of Social Insurance.

Marshal F. Folstein, M.D., is Chair and Professor of Psychiatry at Tufts University School of Medicine and Psychiatrist-in-Chief at the New England Medical Center (NEMC). Prior to joining NEMC, he was Eugene Meyer III Professor of Psychiatry and Medicine at the Johns Hopkins Medical Institutions. His expertise and research interests are in neuropsychiatry, disability research, and Alzheimer's Disease. Dr. Folstein created the Mini-Mental State Examination, widely used for assessing cognitive mental status in medical patients and in population surveys. He is a Fellow of the American College of Physicians, the American Psychiatric Association, and the Gerontological Society; and a member of the American Neurological Association and the Society for Epidemiological Research.

Robert M. Groves, Ph.D., is a Professor of Sociology and Research Scientist at the Institute for Social Research at the University of Michigan, and is Director of the Joint Program in Survey Methodology, based at the University of Maryland, a National Science Foundation-sponsored consortium of the University of Maryland, University of Michigan, and Westat, Inc. From 1990 to 1992, Dr. Groves was an Associate Director of the U.S. Census Bureau, on loan from Michigan. He has over 25 years of experience with large scale surveys, and has investigated the impact of alternative telephone sample designs on precision, the effect of data collection mode on the quality of survey reports, causes and remedies for nonresponse errors in surveys, estimation and explanation of interviewer variance in survey responses, and other topics in survey methods. His current research interests focus on theory-building in survey participation and models of nonresponse reduction and adjustment. He is a fellow of the American Statistical Association, an elected member of the International Statistical Institute, former President of the American Association for Public Opinion Research, and currently Chair of the Survey Research Methods Section of the American Statistical Association.

Alan M. Jette, Ph.D., is Professor and Dean of Boston University's Sargent College of Health and Rehabilitation Sciences, and Professor of Social and Behavioral Sciences at the Boston University School of Public Health. His previous appointments have included: Chief Research Scientist, New England Research Institute; Associate Professor, Massachusetts General's Institute of Health Professions; and Assistant Professor, Division on Aging, Harvard Medical School. Dr. Jette's research interests include measurement, epidemiology, and prevention of disability and



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