Penn, the Unlimited Fight Championship hall of famer known as The Prodigy, started preparing for retirement long before he retired with the launch of, a mixed martial arts site that has grown over the last decade into the dominate MMA news and information source.

Penn, who is one of only two men in UFC history to win two titles in two different weight classes, is a force of nature outside the cage as well as in it. In addition to, his media interests include film, radio and a New York Times best-selling autobiography, "Why I Fight: The Belt is Just an Accessory." He also co-authored "Mixed Martial Arts: The Book of Knowledge," oversees a clothing line, and owns Penn Training and Fitness in his hometown of Hilo, Hawaii.