Mihaly Csikszentimhalyi, Ph.D.
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Robert J. Vallerand, Ph.D.
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Sonja Lyubomirsky, Ph.D.
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Happiness: Unlocking the Mysteries of Psychological Wealth, Ed Diener, Ph.D.
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Carmelo Vázquez, Ph.D.
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Jonathan Haidt, Ph.D.
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Martin E. P. Seligman, Ph.D.
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Shane Lopez, Ph.D.
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Sonja Lyubomirsky, Ph.D.
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