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Known for his work on learned helplessness, the PERMA model, and as the founder of the field of Positive Psychology.

Famous for his research on flow, a state of intense focus and immersion in activities.

Developed the Six-factor Model of Psychological Well-being which includes autonomy, environmental mastery, personal growth, positive relations with others, purpose in life, and self-acceptance.

Developed the Broaden-and-Build Theory of positive emotions, which posits that positive emotions expand our awareness and encourage novel, varied, and exploratory thoughts and actions.

Known for his work on subjective well-being and happiness, developing the Satisfaction with Life Scale.

Co-author of 'Character Strengths and Virtues' with Seligman and known for his work on character strengths and positive institutions.

Authored 'The How of Happiness', a book on the scientific underpinnings of happiness, and developed the Subjective Happiness Scale.

Taught the largest course at Harvard, 'Positive Psychology', and specializes in the intersection of positive psychology and leadership.

Best known for her research on grit, a trait related to perseverance and passion for long-term goals.