Robert R. McCrae, Ph.D., is Research Psychologist at the Gerontology Research Center, National Institute on Aging, Baltimore, Maryland. He is author of more than 100 chapters and journal articles on personality, stress, coping, and aging, and is co-author of the NEO Personality Inventory. He is also a member of the Gerontological Society of America and a Fellow of the American Psychological Association.
Paul T. Costa, Jr., Ph.D., is Chief, Laboratory of Personality and Cognition, Gerontology Research Center, National Institute on Aging, Baltimore, Maryland, and is Associate Professor of Medical Psychology at the Johns Hopkins University School of Medicine. He has served as Consulting Editor for such journals as Psychology and Aging and The Journal of Personality and Social Psychology and is Past-President of the American Psychological Association's Division of Aging and Adult Development.