Gary Rich Burghoff is an American actor who is known for originating the role of Charlie Brown in the 1967 Off-Broadway musical You're a Good Man, Charlie Brown, and the character Corporal Walter Eugene "Radar" O'Reilly in the film M*A*S*H, as well as the TV series. He was a regular on television game show Match Game from 1974 to 1979 for 204 episodes, standing in for Charles Nelson Reilly, who was in New York doing a Broadway play, and continued to make recurring appearances afterwards.