" It was the rare actor who brought authenticity to the screen; one exception was Tom Mix, a former ranch hand from Oklahoma. The “King of the Cowboys,” Mix made over 160 films and was a frequent visitor when Wyatt and Josephine were in Los Angeles, sometimes accompanying Wyatt to the racetrack. William S. Hart was another Earp acolyte. Where Tom Mix was a rough-and-ready showman, Hart was classically trained, as comfortable in a Shakespearean tragedy as he was in a Western. "

― Ann Kirschner , Lady at the O.K. Corral: The True Story of Josephine Marcus Earp