Maurice Greene (born July 23, 1974) is a former American track and field sprinter who specialised in the 100 meters and 200 meters. He is a former 100 m world record holder with a time of 9.79 seconds. During the height of his career (1997 2001) he won two Olympic gold medals and was a five-time World Champion. This included three golds at the 1999 World Championships, a feat which had previously only been done by Carl Lewis. His career was affected by a number of injuries from 2003 onwards, although he won the 100 meters bronze and silver in the sprint relay at the 2004 Summer Olympics. Greene was also successful indoors: he was the 1999 Indoor World Champion and remains the world record holder in the 60 meter dash and the joint-fastest man over 50 meters. He raced sparingly after an injury in 2005 and officially retired in 2008. Over his career, he made the second most sub-10 second runs in the 100 m (after Asafa Powell). However, his achievements came under scrutiny when he admitted to buying performance-enhancing drugs in 2008, although he denied having ever used them himself.