Michael Phelps is an Olympic swimmer who has won a record 23 gold medals and 28 total medals, making him the most decorated Olympian of all time. He was born in Maryland and started swimming at age 7, then made his first Olympic team at age 15 in 2000. At the 2008 Beijing Olympics, Phelps won 8 gold medals, cementing his status as one of the greatest swimmers in history.