Greg Morris (b. 1933, d. 1996) plays Barney Collier in all nine seasons of Mission: Impossible (only one episode in the eighth season and two in the ninth).
Morris was an American actor who has appeared in episodes of The Dick Van Dyke Show, Branded, Sanford and Son, What's Happening!!, Vega$, The Jeffersons, and Fantasy Island. On the three part episode "Mission Incrediable" on the comedy "The Jeffersons" he played a professional con man who helps George Jefferson con two con men.