Answer:
Martin Seligman
Explanation:
Martin Seligman was a positive psychologist. he was president of APA in 1988. his initiative in APA was to promote positive psychology in the field of scientific study. He was the leading authority figure of positive psychology, learned helplessness, resilience, well being, learned optimism. he also worked on intervention of depression, anxiety, and build strength and well being. His theory learned helplessness was popular among scientific research and clinical psychology. Martin Seligman works on positive aspects of life such well being, resilience power, etc.