B.J. Penn net worth: B.J. Penn is an American mixed martial artist and Brazilian Jiu-Jitsu practitioner who has a net worth of $22 million. B.J. Penn is most famous for being a competitor in the Ultimate Fighting Championship. In the World Jiu-Jitsu Championship in the black-belt category Penn is the first non-Brazilian winner. He is a former UFC Lightweight Champion and UFC Welterweight Champion. He is only the second fighter in UFC history to win titles in two different weight classes. Penn also served as a coach on The Ultimate Fighter 5 reality show. Nicknamed "The Prodigy" B.J. was born Jay Dee Penn in Kailua, Hawaii in December 1978. He fought in the Ultimate Fighting Championship and K-1. Before becoming a pro Penn was the first American to win a Gold medal in the World Jiu-Jitsu Championship. He became the second person to win UFC titles in multiple weight classes, winning the UFC Lightweight and Welterweight Championships. He became the first UFC Lightweight Undisputed Champion and broke the UFC's all-time title defense record for that title. He was undefeated for more than eight years as a lightweight. He won a world title with K-1. Dana White, the UFC President, has credited Penn with bringing the lower weight divisions into the mainstream. He is considered to be one of the best Lightweight fighters in MMA history, as well as one of the sport's greatest fighters period. He has authored two books. Dana White has said that Penn will be inducted into the UFC Hall of Fame. He has acted in the 2009 film Never Surrender and the TV series Hawaii Five-0. He was a head coach on The Ultimate Fighter 5 and The Ultimate Fighters: Team Edgar vs. Team Penn.