Career At the Melbourne Olympics, Mashburn ran the third leg in the gold medal winning American 4x400 m relay team
Achievements Born in Seminole, Oklahoma, Mashburn won the Amateur Athletic Union championships in 440 yd (400 m) in 1953 and as an Oklahoma State University student the National Collegiate Athletic Association 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