He was the chairman and chief executive officer (CEO) of Hospital Corporation of America.
[2] With his wife, he has supported his alma mater, Belmont University, where a building is named in their honor.
[4][5] He attended Nashville State Community College and won a scholarship to transfer to Belmont University,[4] where he graduated with a bachelor's degree in accounting.
[4] The same year, the university named the R. Milton and Denice Johnson Center in their honor.
[11] In 2015, Johnson donated US$1,500 in political contributions to Megan Barry's successful campaign to become Mayor of Nashville.