Freestyle swimmer who won the 800m gold at the 2012 London Olympics before the age of 15, with the second fastest performance ever.
She learned to swim at age 6 and eventually joined the Nation's Capital Swim Club.
She broke the national record for the 800 meter freestyle at the 2012 London games.
She has an older brother named Michael, who is also a swimmer.
She, like Michael Phelps, won a gold medal for the United States at the 2012 London Olympics.