Michael Phelps is an American swimmer who has won 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time. He was born in 1985 in Baltimore, Maryland and began swimming competitively at age 7, holding a national record by age 10. At the 2000, 2004, 2008, and 2016 Olympics, Phelps won multiple gold medals in individual events and relays, setting numerous world records in the process. He is considered the greatest swimmer of all time.