Tal Ben-Sha­har, PhD, has writ­ten eight books, includ­ing the New York Times best­seller Hap­pi­er. He is the co-founder of the Hap­pi­ness Stud­ies Acad­e­my and Poten­tial­ife. Ben-Sha­har taught the largest course at Har­vard, Pos­i­tive Psy­chol­o­gy, and the third largest, The Psy­chol­o­gy of Lead­er­ship, attract­ing 1,400 stu­dents per semes­ter‚ approx­i­mate­ly twen­ty per­cent of all Har­vard undergraduates.