Johnson ran unsuccessfully for the
Cobb County Commission in 2020 and state school superintendent in 2014. On July 21, 2021, Governor
Brian Kemp appointed him to the
Georgia Public Service Commission, filling the unexpired term of District 3 Commissioner
Chuck Eaton, who had resigned to become a
Georgia Superior Courts judge. Sworn in on August 26, 2021, Johnson became the second African American, and the first African-American
Republican, to serve as a Georgia public-service commissioner. He chaired the commission's telecommunications committee until September 2023, and he subsequently chaired the energy committee. In 2023, the
National Association of Regulatory Utility Commissioners appointed him chair of the Task Force on Evolving Gas Infrastructure Planning. Johnson ran for a full term on the commission, winning the Republican primary in May 2022. However, in August 2022, Judge
Steven D. Grimberg of the
United States District Court for the Northern District of Georgia ruled in favor of black voters that had sued in 2020 to strike down
at-large elections used to elect Public Service Commissioners, alleging that the system diluted the black vote and thus violated the
Voting Rights Act of 1965. The State of Georgia appealed the ruling, and the
11th Circuit Court of Appeals overturned Grimberg's decision. The plaintiffs then appealed to the
U.S. Supreme Court, which reversed the reversal and returned the case to the circuit court for review. As of November 2, 2023, the circuit court has not rendered a decision. Until an election is held, Johnson and fellow commissioner
Tim Echols will remain in office, even though Johnson's term expired on December 31, 2022. Johnson has served on the boards of the State Charter Schools Commission,
Wellstar Health System,
Life University, the
Kennesaw State University Foundation, the Cumberland Counseling Center, and the
Women's Professional Soccer League. He is a former owner of the
Atlanta Beat (WPS) professional soccer team from 2008 to 2011 and has supported fundraising and construction of Kennesaw State University's
Fifth Third Stadium. In a 2025 special election, Johnson was defeated by Democrat
Peter Hubbard. == Personal life ==