Trinidadian sprinter and hurdler who won the Olympic gold medal in the 4x400 meter relay event at the 2008 Olympic Games. He won four titles at the IAAF World Championships from 2007 to 2009.
He was named Gatorade High School Track and Field Athlete of the Year at La Porte High School in Texas.
He broke Michael Johnson's world record in the indoor 4x400 meter relay event in 2005.
His mother, Claudette, raised him as a single parent.
He and sprinter Justin Gatlin both represented the United States at the 2012 Olympic Games in London.