Mr. Keen, Tracer
of Lost Persons was on the radio about seventeen and 1/2 years which
obviously says something about its audience appeal. The first show
aired on NBC on October 12, 1937. It moved to CBS in 1947 and the
last episode was broadcast on April 19, 1955.
Three actors played the role of Mr. Keen starting with Bennett Kilpack. He was followed by Arthur Hughes and later by Phil Clarke. Mr. Keen's not to bright assistant, Mike Clancy was played by Jim Kelly.
Something of interest, the Mr. Keen, Tracer of Lost Persons theme was a song named "Someday I'll Find You."