Dan Henderson is a legendary mixed martial artist and former Olympic wrestler. He is a two-time UFC tournament champion and a former Pride FC champion. He is widely considered to be one of the greatest MMA fighters of all time, having competed in the sport for over two decades
From Wikipedia
Daniel Jeffery Henderson is an American former mixed martial artist and Olympic wrestler, who last competed as a Middleweight in the Ultimate Fighting Championship. He was the last Strikeforce Light Heavyweight Champion and was the last Welterweight and Middleweight champion of Pride Fighting Championships. He was the only double champion in the history of Pride FC.