James E. Birren is currently Associate Director of the Center on Aging at the University of California, Los Angeles, and serves as an adjunct professor in medicine, psychiatry, and biobehavioral sciences. He is also professor emeritus of gerontology and psychology at the University of Southern California. Dr. Birren's previous postions include service as Chief of the section on aging of the National Institute of Mental Health, founding Executive Director and Dean of the Ethel Percy Andrus Gerontology Center of USC, founding Director of the Anna and Harry Borun Center for Gerontological Research at UCLA, and President of the Gerontological Society of America, the Western Gerontological Society, and the Division on Adult Development and Aging of the American Psychological Association. Dr. Birren's many awards include the Brookdale Foundation Award for Gerontological Research, the Sandoz prize for Gerontological Research, and the award for outstanding contribution to gerontology by the Canadian Association of Gerontology. Author of over 250 scholarly publications, Dr. Birren has research interests including how speed of behavior changes with age, the causes and consequences of slowed information processing in the older nervous system, the effect of age on decision-making processes, and the role of expertise in skilled occupations. He has served as a delegate to several White House Conferences on Aging and continues to have a strong interest in developing national priorities for research and education related to issues of aging. K. Warner Schaie is the Evan Pugh Professor of Human Development and Psychology and Director of the Gerontology Center at the Pennsylvania State University. He also holds an appointment as Affiliate Professor of Psychiatry and Behavioral Science at the University of Washington. A fellow of the Gerontological Society and the American Psychological Association, Professor Schaie has served as president of the APA Division of Adult Development and Aging and as editor of the Journal of Gerontology: Psychological Sciences. Author of over 250 scholarly publications on the psychology of aging, Dr. Schaie has interests including the life course of adult intelligence, its antecedents and modifiability, and methodological issues in the developmental sciences. Dr. Schaie has received the Kleemeier Award for Distinguished Research Contributions from the Gerontological Society of America and the Distinguished Scientific Contributions Award from the American Psychological Association.