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
The Love Boat
M*A*S*H
Hollywood Squares
Tales of the Unexpected
Dinah!
Fantasy Island
Burke's Law
Wonder Woman
CHiPs
Donny & Marie
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$weepstake$
AfterMASH
The Good Guys
M*A*S*H
Twigs
Casino
Altman on His Own Terms
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Enlisted: The Story of 'M*A*S*H'
The Man in the Santa Claus Suit
Memories of M*A*S*H
M*A*S*H: The Comedy That Changed Television
B.S. I Love You
M*A*S*H: 30th Anniversary Reunion
Small Kill
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Making 'M*A*S*H'
Daniel's Lot
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The Real M*A*S*H
W*A*L*T*E*R
Behind the Waterfall
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Pets: Part of the Family