[2] Johnson began his professional career in the NBA D-League where he played for the Anaheim Arsenal and Rio Grande Valley Vipers from 2007–2008.

After that, he played in the Korean Basketball League (KBL) with the Changwon LG Sakers and Jeonju KCC Egis from 2008–2010.

[7][8] On May 12, 2012, the NBA fined Johnson $25,000 for gesturing, again with his middle finger, at a Boston Celtics fan following the Hawks’ elimination from the playoffs.

[18] On January 13, 2016, Johnson signed once again with the defending champion Tropang TNT as the team's import for the 2016 PBA Commissioner's Cup.

[19] Days before the Commissioner's Cup, he was figured in a brawl with two players of Blackwater Elite in the team's tune-up game in Moro Lorenzo Gym.

[20] On February 13, 2016, Johnson was "banned for life" from the PBA and fined 250,000 pesos after he disrespected and cursed the PBA commissioner Chito Narvasa during their game against Meralco Bolts, earlier in the game he was called for a technical foul for second motion on Meralco's Forward/Center Kelly Nabong and a flagrant foul one penalty after he gave an elbow to the face of Meralco's Forward/Center Bryan Faundo and his second technical foul came from his encounter with the commissioner Narvasa that led him to be ejected from the game.

[21] Johnson, through his Twitter account, later apologized to Commissioner Narvasa and thanked the PBA for giving him the chance to return as the import of the Tropang TNT for the second consecutive time.