Martin E. P. Seligman is a professor of psychology at the University of Pennsylvania. He is the author of several books, including Learned Optimism and Authentic Happiness, and is the past president of both the American Psychological Association and its division of clinical psychology.
Educated at Juilliard, Paul Costanzo brings the sensitivity and nuance of a classical music background to his twenty-five-plus years of voice acting, and AudioFile magazine has called his narration "superb."