Married to actresses Dorcas Matthews and Ottie Ardine, George got his start at 14 years of age, as a singing and dancing waiter in Chicago. McKim began a long career on the stage with the Alcazar stock company in San Francisco. In vaudeville , he teamed for many years with Johnny Cantwell. He later worked for Triangle and the Ince Company and was one of the founders of the National Vaudeville Artists. McKim is best remembered as the rival of Douglas Fairbanks in "The Mark of Zorro" (1920). McKim was stricken with a cerebral hemorrhage while on stage in Salt Lake City and brought back to Hollywood where he passed away, leaving his wife, actress Dorcas, and two small children.