Gary Burghoff
Gary Richard Burghoff (born May 24, 1943) is an American actor, known for playing the character Corporal Walter Eugene "Radar" O'Reilly in the MASH series and Charlie Brown in the 1967 Off-Broadway musical You're a Good Man, Charlie Brown. Description above from the Wikipedia article Gary Burghoff, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Filmography
M*A*S*H
The Love Boat
CHiPs
The Merv Griffin Show
Fantasy Island
Tales of the Unexpected
Hollywood Squares
Wonder Woman
Dinah!
Burke's Law
Donny & Marie
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$weepstake$
AfterMASH
M*A*S*H
The Good Guys
Casino
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Enlisted: The Story of 'M*A*S*H'
M*A*S*H: 30th Anniversary Reunion
M*A*S*H: The Comedy That Changed Television
Altman on His Own Terms
Memories of M*A*S*H
Twigs
Small Kill
B.S. I Love You
The Man in the Santa Claus Suit
Behind the Waterfall
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The Real M*A*S*H
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Making 'M*A*S*H'
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Pets: Part of the Family
Daniel's Lot