William Bennett Kilpack (February 6, 1883 in Long Melford – August 17, 1962 in Santa Monica) known simply as Bennett Kilpack, was an actor, director and playwright. He is best known for his performances in the title role of Mr. Keen, Tracer of Lost Persons (from 1937–1947 on NBC Radio's Blue Network, which became the ABC network in 1945, then from 1947 to 1955 on CBS Radio). The drama was one of radio's longest running Old-Time Radio shows (October 12, 1937 to April 19, 1955), continuing well into the television era.