Martin Seligman
Psychologist; a founder of Positive Psychology movement
http://www.positivepsychology.org/
http://www.psych.upenn.edu/~seligman/
http://www.psych.upenn.edu/seligman/pospsy.htm
author of Authentic Happiness, Learned Optimism, What You Can Change And What You Cant, etc.
Was President of the American Psychological Association
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