Jack Garner was an American actor, best known for The Rockford Files and numerous other television roles. He was the elder brother of James Garner. Early life and career · Acting. Jack Garner was born on September 19, in Norman, Oklahoma, USA as Jack Edward Bumgarner. He was an actor, known for My Fellow Americans (). He was the elder brother of actor James Garner. Jack and James eventually moved to Los Angeles to reconnect with their father, who had.