Matt Killingsworth, Ph.D., is a Robert Wood Johnson Health and Society Scholar. He studies the nature and causes of human happiness, and is the creator of www.trackyourhappiness.org which uses smartphones to study happiness in real-time during everyday life. His recent research has focused on the relationship between happiness and the content of everyday experiences, the percentage of everyday experiences that are intrinsically valuable, and the degree of congruence between the causes of momentary happiness and of one's overall satisfaction with life. Matt earned his Ph.D. in psychology at Harvard University.