BJ Penn is an American mixed martial artist and Brazilian Jiu-Jitsu practitioner who competes in the Ultimate Fighting Championship. Penn was the first non-Brazilian winner of the World Jiu-Jitsu Championship in the black-belt category. He is known for his willingness to fight anyone regardless of weight class, fighting as high as heavyweight when he competed against Lyoto Machida in 2005.
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, with the first being UFC Hall of Famer Randy Couture. Penn served as a coach on The Ultimate Fighter 5 reality show. Penn is currently ranked as the #2 welterweight fighter in the world by Fight! Magazine and #8 welterweight fighter by MMAWeekly. Nicknamed "The Prodigy" for his astonishingly natural talent, Penn holds victories over former UFC champions Jens Pulver, Matt Serra, Sean Sherk and Matt Hughes, as well as former PRIDE champion Takanori Gomi. His record also includes notable wins over Caol Uno, Renzo Gracie, Kenny Florian and Diego Sanchez.