Remember Dr. Dave Kelsey?
Bob Crane (July 13, 1928 – June 29, 1978).
Robert Edward Crane was an American actor, drummer, radio personality, and disc jockey.
He joined the cast of The Donna Reed Show in the latter part of Season 5, as Dr. Dave Kelsey, a colleague of Alex. He continued through Seasons 6 and 7, then went on to play the part of Col. Hogan on the CBS situation comedy Hogan's Heroes.