For Image Comics he has worked on titles including Erik Larsen's SuperPatriot and Robert Kirkman's Invincible.
His interest in the medium was renewed in the late 1970s, beginning with Chris Claremont and John Byrne's run on The Uncanny X-Men.
Johnson studied painting at the Art Institute of Atlanta, but ultimately became more interested in illustration,[2] specifically on the ability to instantly convey information in a single image, explaining at WonderCon in 2009, "[With] billboards, you have five seconds to deliver a message."
[6] In April 2022, Johnson was reported among the more than three dozen comics creators who contributed to Operation USA's benefit anthology book, Comics for Ukraine: Sunflower Seeds, a project spearheaded by editor Scott Dunbier, whose profits would be donated to relief efforts for Ukrainian refugees resulting from the February 2022 Russian invasion of Ukraine.
When painting, Johnson begins by applying the darkest pigments, before layering on lighter colors with acrylic, saying, "I'm trying to be less opaque and more brushy.