Education
Mangin was educated at the Georgetown University and learnt lawn tennis in Montclair, New Jersey.
Mangin was educated at the Georgetown University and learnt lawn tennis in Montclair, New Jersey.
In 1931 Mangin, partnering compatriot Berkeley Bell, were runners-up in the doubles final of the United States. National Championships, played in Brookline, Master of Arts, losing in straight sets to compatriots John Van Ryn and Wilmer Allison. During World World War II Mangin enlisted in the United States Army Air Forces (American Advertising Federation). He became a tail gunner on the B-17 Flying Fortress and flew 50 missions over Europe.
He was wounded twice in missions over Italy and France and shot down two Master of Engineering-109s in a mission over Germany.
Doubles
= Runners-up (1) =.
He won the singles title at the United States. Indoor Championships, played at the Seventh Regiment Armory in New York, in 1932, 1933, 1935 and 1936. He was a member of the United States Davis Cup teams in 1930 and 1931 but did not play any matches. Reaching the rank of staff sergeant he received the Distinguished Flying Cross (Distinguished Flying Cross), the Air Medal with six clusters and a Purple Heart with one cluster.