Gary Richard Burghoff (born May 24, 1943) is an American actor, known for playing the character Corporal Walter Eugene "Radar" O'Reilly in the M*A*S*H series and Charlie Brown in the 1967 Off-Broadway musical You're a Good Man, Charlie Brown.
Burghoff was born in Bristol, Connecticut and got started in acting and drumming during his high school years in Delavan, Wisconsin. He later was the drummer for a band called the Relatives in 1968. Actress Lynda Carter was the band's singer. The group opened at the Sahara Hotel and Casino lounge in Las Vegas, Nevada for three months. Remaining friends, Carter helped cast him in an episode of her later hit series Wonder Woman, in the 1978 episode "The Man Who Wouldn't Tell."
Although several actors from the original MASH film made guest appearances in the television series, Burghoff was the only actor cast as a regular.