Martin Seligman is an American psychologist, educator, and author of self-help books. Since the late 90’s, Seligman has been an avid promoter within the scientific community for the field of positive psychology. His theory of learned helplessness is popular among scientific and clinical psychologists. A Review of General Psychology survey, published in 2002, ranked Seligman as the 31st most cited psychologist of the 20th century. Seligman is the Zellerbach Family Professor of Psychology in the University of Pennsylvania’s Department of Psychology. He was previously the Director of the Clinical Training Program in the department. He is the director of the university’s Positive Psychology Center. Seligman was elected President of the American Psychological Association for 1998.Seligman has written about positive psychology topics in books such as The Optimistic Child, Child’s Play, Learned Optimism, and Authentic Happiness. His most recent book, Flourish, was published in 2011.