William Elmer Booth (9 December 1882 - 16 June 1915) was an American actor. He was born in Los Angeles, California and was the elder brother of film editor Margaret Booth.Elmer began acting in touring stock companies as a teenager and achieved great success in the stock company at the Central Theater in San Francisco from 1903-1906. Between 1910 and 1915 he starred in 40 movies; one of those was D. W.