Charlie Chaplin produced some of the greatest films of all time, including The Gold Rush, The Circus, City Lights, Modern Times, and The Great Dictator. Before making a name for himself as an undisputed master of cinema, however, Chaplin first developed his acting, writing, and directing skills at Keystone Studios. Mack Sennett, who attended one of Chaplin's music hall shows, thought the entertainer would be a good fit at his newly established studio,...