Hardly a neglected artist, Buster Keaton attracts biographers and film scholars capable of incisive comment on his work. He continues to draw the serious attention of both popular writers and scholars because as a comic genius and major comedy filmmaker during the silent age he rivals Charlie Chaplin. Yet writers have focused on the full-length films from 1923 to 1928, when Keaton joined MGM, lost his creative freedom, and began a glide toward...