In 2004 he started in the professional field for the first time and set his first best performance with 10.39 seconds. At the Junior World Championships, he won the gold medal with the 4 x 100 meter relay. The next year he also ran the 200-meter distance.
In 2010 he ran at the World Indoor Championships in Doha at 60 meters with 6.59 s in fourth place, two years later he also finished fourth at the World Indoor Championships in Istanbul . Before that, he had set his new personal best in February with 6.45 s at 100 meters and at the same time also set the world best time for the year.
At the Olympic Games in London he won the 4 x 100 meter relay competition together with Justin Gatlin , Tyson Gay and Ryan Bailey silver, with 37.04 they set a new national record at the same time. Due to a positive doping test Gays them was the medal again in May 2015 revoked . In September 2016, Kimmons himself tested positive and banned for two years for doping.