Jack worked as a bookkeeper for Samuel Goldwyn Studios and then as a controller for Hopalong Cassidy Productions, but he was told by a doctor that if he continued to stare at small numbers for much longer that he would lose the sight of his good eye. He made a deal with a desperate movie director friend and offered to get his movies financed if he would give him an acting part in his movies thus launching his long career in show business.
Jack was married to Jean Elam from 1937 until her death on January 24th, 1961. He was then married to Margaret Jennison from August 23rd, 1961 until his death on October 20th, 2003.