Ross Martin (born Martin Rosenblatt, March 22, 1920 – July 3, 1981) was an American radio, voice, stage, film, and television actor. Martin was best known for portraying Artemus Gordon on the CBS Western series The Wild Wild West, which aired from 1965 to 1969. He was the voice of Doctor Paul Williams in 1972's Sealab 2020, additional characters in 1973's Butch Cassidy and the Sundance Kids, and additional character voices in 1978's Jana of the Jungle.
Source : Wikipedia