Martin E.P. Seligman, Ph.D., the Robert A. Fox Professor of Psychology at the University of Pennsylvania, works on positive psychology, learned helplessness, depression, ethnopolitical conflict, and optimism. Dr. Seligman's work has been supported by the National Institute of Mental Health, the National Science Foundation, the Guggenheim Foundation, the Mellon Foundation, and the MacArthur Foundation. He is the director of the Positive Psychology Network and scientific director of Foresight, Inc., a testing company that predicts success in various walks of life. He was for fourteen years t...