The defining characteristic of pessimists is that they tend to believe bad events will last a long time, will undermine everything they do, and are their own fault.

Martin Seligman

Psychologists

Martin Seligman

U.S. psychologist (b.1942). Discovered learned helplessness in 1967, founded positive psychology as 1998 APA president, and proposed the PERMA model. His role in the CIA Enhanced Interrogation case is a noted dispute.

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