Michael Duane Johnson is a retired American sprinter. He won four Olympic gold medals and eight World Championships gold medals. Johnson currently holds the world and Olympic records in the 400 m. He formerly held the world and Olympic record in the 200 m, and the world record in the indoor 400 m. He also currently holds the world's best time at the 300 m. His 200 m time of 19.32 at the 1996 Summer Olympics stood as the record for over 12 years. Johnson is generally considered one of the greatest and most consistent sprinters in the history of track and field.
He is the only male athlete in history to win both the 200 meter dash and 400 meter dash events at the same Olympics, a feat he accomplished at the 1996 Summer Olympics in Atlanta. Johnson is also the only man to successfully defend his Olympic title in the 400 m. Aside from his Olympic success Johnson accumulated eight gold medals at World Championships, and is thus tied with Carl Lewis and Usain Bolt for the most gold medals won by any runner in history.
Johnson's stiff upright running stance and very short steps defied the conventional wisdom that a high knee lift was essential for maximum speed. As of 2012, Johnson holds 13 of the top 100 times for the 200 meters and 27 of the top 100 times for the 400 meters. Of those, he holds 14 of the top 25 times for the 400 meters. He broke 44 seconds for the 400 metres twenty-two times, more than twice as many times as any other athlete.