A native of Tylertown, Miss., Mangum has collected a lengthy list of honors as he enters his 44th season with the Saints, including being inducted into the Louisiana Athletic Trainers Association Hall of Fame in 2008.
His contributions have helped the Saints athletic training staff earn several awards, including the 2007 Southeastern Athletic Trainers' Association (SEATA) Professional Athletic Trainers Award, the Fain Cain Memorial Award in 2006 and the NFL Athletic Training Staff of the Year in 1986 and 2006. Mangum received the Southeast Athletic Trainers Association's 1991 Backbone Award, which recognizes an outstanding assistant athletic trainer in the region. In 2015, he was the NFC recipient of the Tim Davey Assistant Athletic Trainer Award, as voted on by his NFL peers with the Professional Football Athletic Trainers Society. In 2022, he was honored by the Saints Hall of Fame with the Joe Gemelli "Fleur-De-Lis" Award, the hall's annual honor recognizing contribution to the franchise. Mangum is a member of both the Southwest Mississippi Junior College and University of Southern Mississippi Sports Hall of Fames.
Mangum was a student athletic trainer for two years at Southwest Mississippi Junior College and two more at the University of Southern Mississippi before joining the Saints in 1981. He received a bachelor's degree in athletic administration with a specialization in athletic training from USM in 1981 and an advanced degree in physical education from the University of New Orleans in 1988.