Jesse William "John" Mashburn (born February 14, 1933) is an American former athlete, winner of gold medal in 4x400 m relay at the 1956 Summer Olympics.Born in Seminole, Oklahoma, Mashburn won the AAU championships in 440 yd (400 m) in 1953 and as an Oklahoma State University student the NCAA championships in 440 yd (400 m) in 1955 and 1956.At the 1955 Pan-American Games, Mashburn was third in 400 m and won a gold medal as a member of American 4x400 m relay team.At the Melbourne Olympics, Mashburn ran the third leg in the gold medal winning American 4x400 m relay team.