Mark Victor Hansen (Author) Mark Victor Hansen is the co-author of the largest selling book series in history - Chicken Soup for the Soul. Over 65 million copies sold worldwide. Jack Canfield (Author) Jack Canfield and Mark Victor Hansen are bestselling authors and motivational speakers who have dedicated their lives to enhancing the professional and personal development of others. They are the co-authors of Chicken Soup for the Soul, Chicken Soup for the Teenage Soul and Chicken Soup for the Woman's Soul. Martin Seligman (Author) Martin E.P. Seligman, Ph.D., is the Zellerbach Family Professor of Pyschology and the Director of the Positive Psychology Center at the University of Pennsylvania. Among his 20 books are Learned Optimism, What You Can Change and What You Can t, The Optimisitc Child and Authentic Happiness. His books have been translated into 25 languages and he regularly tours Australia.