Ph.D.

Stephen G. Post, Ph.D.

April 1, 2014|

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Barbara Fredrickson, Ph.D.

March 30, 2014|

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Ed Diener, Ph.D.

March 30, 2014|

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Mihaly Csikszentimhalyi, Ph.D.

March 30, 2014|

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Robert J. Vallerand, Ph.D.

March 30, 2014|

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Sonja Lyubomirsky, Ph.D.

March 30, 2014|

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