Martin Seligman, PhD, is a professor at the University of Pennsylvania, director of the Positive Psychology Center, and former president of the American Psychological Association. He received his BA in philosophy from Princeton University, and his PhD in psychology from the University of Pennsylvania and holds ten honorary doctorates. He was named the most influential psychologist in the world by Academic Influence. Along with writing for numerous scholarly publications and appearing in The New York Times, Time, Newsweek, and many others, he is also the author and coauthor of over thirty books, including Flourish, Authentic Happiness, and Tomorrowmind.