Martin Seligman — American Psychologist born on August 12, 1942,
Martin E. P. "Marty" 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... (wikipedia)
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