Tal Ben-Shahar, PhD, taught the historically largest course at Harvard, "Positive Psychology," and the third largest, "The Psychology of Leadership," attracting 1,400 students per semester -approximately 20 percent of all Harvard graduates. 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 previous books, including international bestsellers Happier and Being Happy, which have been translated into more than twenty-five languages.