In both New York and Chicago, he was a staple on many soap operas, playing romantic leads on Big Sister (as Dr. Bernard),[4] on the radio version of The Guiding Light (as enigmatic stranger Ellis Smith), 1943's Brave Tomorrow (as Hal Lambert),[5] Kate Hopkins, Angel of Mercy (as Robert Atwood) and Valiant Lady (as Paul Morrison).

Johnson was also heard as Mr. District Attorney in 1939,[7] Roger Kilgore, Public Defender, Calling All Cars, and starred in radio adaptations of the comic strips Don Winslow of the Navy" and Mandrake the Magician.

Still other radio dramas included appearances on such diverse anthologies as Cavalcade of America, Gangbusters, Dimension X (and its sequel X Minus One), the wartime series Words at War, Famous Jury Trials and Cloak and Dagger.

Johnson provided the voice of Abraham Lincoln on the Decca recording of Earl Robinson’s and Millard Lampell’s ‘folk cantata,” The Lonesome Train, 21–22 March 1944.

Stricken with multiple sclerosis from his 40s onward, limiting his activities in later years, Johnson was still a frequent presence at old time radio conventions, performing in recreations and reprising "Raymond", often from a portable bed or wheelchair.