Jon Jones is an American mixed martial artist signed with the Ultimate Fighting Championship, where he is the UFC Light Heavyweight Champion. When he won the title in March 2011, he became the youngest champion in UFC history. As of December 2012, he was ranked as the #1 light heavyweight fighter in the world by various media outlets. He was also ranked the #1 pound-for-pound fighter in the world by multiple publications. As of January 2014, he is #1 in official UFC pound-for-pound rankings.