John Mangum, Sr. graduated from Magee High School in 1961.  While playing at MHS, he was chosen as the Best Defensive Lineman.  The Trojans won numerous championships during his time at Magee High School, including the Little Dixie Championship of 1960-61.
John Mangum, Sr. signed with the University of Mississippi and later transferred and finished at the University of Southern Mississippi, where he helped the Golden Eagles lead the nation in defense in 1964-1965.  He was named Best Defensive Lineman that year.
He was an All-Time letter winner while at USM.  He played in the Blue Gray All Star Classic in 1965.
In 1966 he played in the Senior Bowl.  He won the Defensive Tackle Award while at USM.
After graduating from USM, he went on to play for the Boston Patriots as a 5th round draft pick.
John Mangum, Sr. was inducted into the University of Southern Miss Hall of Fame on April 27, 1984.
Following his retirement from professional football, Mangum began his coaching career at Simpson Academy then at Magee High School, followed by a broadcast career with WSJC of Magee and the ownership of a sporting goods store.
Mangum died in 1994.
Mangum and his wife Glenda had two sons and one daughter, Susan.  His sons, John, Jr. and Kris Mangum, followed in their father's footsteps and went on to play collegiate football, as well as professional football.
Mangum's memory will be honored Friday night during halftime of the Magee vs. Mendenhall  game when he joins his two sons and former Trojan football player Justin Griffin as the first four players from Magee High School to have their jerseys retired.