 Amsberry's friend, George Bruns, whom he had grown up with in Oregon, worked as an acclaimed film composer for Walt Disney Studios in Los Angeles, and invited Amsberry to join the Disney studio department in 1955.Amsberry worked on "The Mickey Mouse Club", a then-new series, writing skits as well as acting on the show in various characters.Bob-O, a clown character played by Amsberry on the series, became a minor celebrity, and the character was featured as a live character impersonator at the Disneyland theme park.