Jonathan Dwight Jones is an American professional mixed martial artist, who is signed with the Ultimate Fighting Championship (UFC). Widely regarded as one of the greatest mixed martial artists, he is the current and two-time undisputed UFC Light Heavyweight Champion. He has been champion since December 29, 2018, and previously held the title from March 20, 2011, to April 28, 2015. Jones also held the interim UFC Light Heavyweight Championship. As of August 19, 2019, he is #1 in the UFC men's pound-for-pound rankings.