Johnson accepted an athletic scholarship to attend the University of Florida in Gainesville, Florida, where he played for coach Charley Pell and coach Galen Hall's Florida Gators football teams from 1982 to 1985.[3] Johnson was a key member of the Gators' defense in 1984 and 1985 when the Gators posted identical 9–1–1 overall win–loss records and led the Southeastern Conference (SEC) with best-in-the-conference records of 5–0–1 and 5–1, respectively. He was a first-team All-SEC selection and a first-team All-American in 1984 and 1985, and also a team captain both years.[3] He finished his four-year college career with 335 tackles, 55 tackles for a loss and 27 quarterback sacks.[3]
Johnson was selected by the Philadelphia Eagles in the second round (48th overall) of the 1986 NFL draft.[7] He played for the Eagles from 1986 to 1987.[8] As a rookie, he played in fifteen games and started nine of them at rightside linebacker, with three interceptions.[1] He left the Eagles before the beginning of the 1987 season in order to enter a drug rehabilitation program,[9] and subsequently only played in three games for the Eagles in 1987.[1] He was placed on the non-football injury list in December 1987,[10] and did not play again.[1]
Carlson, Norm, University of Florida Football Vault: The History of the Florida Gators, Whitman Publishing, LLC, Atlanta, Georgia (2007). ISBN0-7948-2298-3.
Golenbock, Peter, Go Gators! An Oral History of Florida's Pursuit of Gridiron Glory, Legends Publishing, LLC, St. Petersburg, Florida (2002). ISBN0-9650782-1-3.
Hairston, Jack, Tales from the Gator Swamp: A Collection of the Greatest Gator Stories Ever Told, Sports Publishing, LLC, Champaign, Illinois (2002). ISBN1-58261-514-4.