Mihaly Csikszentmihalyi says creativity is a central source of meaning in our lives. A leading researcher in positive psychology, he has devoted his life to studying what makes people truly happy: "When we are involved in [creativity], we feel that we are living more fully than during the rest of life." He is the architect of the notion of "flow" -- the creative moment when a person is completely involved in an activity for its own sake.

Csikszentmihalyi teaches psychology and management at Claremont Graduate University, focusing on human strengths such as optimism, motivation and responsibility. He's the director the Quality of Life Research Center there. He has written numerous books and papers about the search for joy and fulfillment.