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Livingston was born Robert Randall. Raised in California, he began his professionl life as a reporter. In the late '20s he began performing onstage and in film shorts. By 1934 he had become an actor in feature films, and in 1936 he began a long stretch as a cowboy star: alongside costars Crash Corrigan and Max Terhune, he appeared as Stony Brooke in the Three Mesquiteers series of Westerns, going on to play the character 29 times; the Mesquiteers were among the Top Ten Western Box-Office attractions in every year from 1937-43. In 1939 he portrayed the Lone Ranger in a serial, then in the early '40s he remained popular as the costar of the Lone Rider series with sidekick Fuzzy St. John; meanwhile, he also played romantic leads in a number of B-movies. Later he appeared in occasional character roles. He was briefly married to starlet Margaret Roach, daughter of film pioneer Hal Roach. His brother was minor actor and singing cowboy Jack Randall.