(born December 24, 1984 in Chicago, Illinois, USA) is an American sprint athlete, who specializes in the 200 meters.
He is a two-time NCAA outdoor champion in the 200 m and won the silver medal in the event at the 2005 World Championships in Athletics.
He has a personal best of 19.65 seconds for the distance, making him the ninth fastest 200 meter runner of all-time, and he formerly held the indoor American record.
He has won the bronze medal twice at the World Championships in Athletics in 2007 and 2009.
He also finished third at the 2008 Summer Olympics, but was later disqualified for stepping out of his lane.