He served as an assistant coach for the Toronto Argonauts, Montreal Alouettes, New York Giants and Detroit Lions.
[1] His coaching career lasted a total of thirty-seven years across a variety of high school, college and professional teams; he began a tenure at Savannah High School in Georgia in 1957 and eventually retired in 1995.
[2] He was also the defensive line coach in 1991 when the Detroit Lions won a playoff game at the Pontiac Silverdome against Jimmy Johnson and the Dallas Cowboys, though they later lost to the Washington Commanders (then the Redskins) in the NFC Championship game.
"[3] Lawrence Taylor, regarded as one of the best defensive players in football history, spoke highly of Leachman in his memoir Living on the Edge, as did Leonard Marshall in his own book, The End of the Line.
[5] His death from chronic traumatic encephalopathy (CTE) was chronicled in The King of Halloween and Miss Firecracker Queen: A Daughter's Tale of Family and Football, a 2018 memoir about growing up in the South with a football coach father authored by Duke University economics professor Lori Leachman.