Tal Ben-Shahar, PhD, is currently teaching at Columbia University - in the past, he taught the largest course at Harvard, "Positive Psychology," and the third largest, "The Psychology of Leadership". Ben-Shahar obtained his BA and PhD from Harvard, and for the last fifteen years has been teaching leadership, happiness, and mindfulness to audiences all over the world. He is the author of six books, including the New York Times bestseller Happier, Choose the Life You Want, and most recently Short Cuts to Happiness.