John Finnegan, or sometimes known as J.P. Finnegan, is an American film actor, mostly known for his roles on the American crime fiction series, Columbo (1971), which aired regularly from 1971 to 1978. Another role included voicing the character, "Warren T. Rat", who was the main villain in the 1986 Don Bluth film, An American Tail (1986). Finnegan was a friend of director/actor John Cassavetes and appeared in 5 of his movies. He also appeared in The Natural (1984), with Robert Redford, as "Sam Simpson", the manager of "Roy Hobbs".