Johnson came to Florida following one season at Houston as its offensive coordinator and QB coach. A native of Baytown, Texas, Johnson joined Houston after three seasons as quarterbacks coach at Mississippi State under Dan Mullen, where he helped develop 2016 NFL Rookie of the Year Dak Prescott and led the Bulldogs to three consecutive bowl games.
Prior to Mississippi State, Johnson became the youngest NCAA FBS offensive coordinator in the nation at age 24 at Utah. As a player, Johnson was a three-year starting QB at Utah and finished his career with the most wins as a starting QB in school history (26-7). In 2008, he led Utah to a 31-17 win over No. 4 Alabama.