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 MAS*H 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.
M*A*S*H
(Cpl. 'Radar' O'Reilly)
W*A*L*T*E*R
(Walter 'Radar' O'Reilly)
Casino
(Bill Taylor)
Behind the Waterfall
(Mr. Connors)
Making 'M*A*S*H'
(Self)
Twigs
(The Priest)
M*A*S*H: The Comedy That Changed Television
(Self)
B.S. I Love You
(Ted)
The Man in the Santa Claus Suit
(Bob Willis)
The Real M*A*S*H
(Himself)
Small Kill
(Fleck / Lady Esmerelda)
M*A*S*H: 30th Anniversary Reunion
(Himself)
Memories of M*A*S*H
(Self / Radar O'Reilly)
Enlisted: The Story of 'M*A*S*H'
(Self)
Daniel's Lot
(Pastor Mahoney)
W*A*L*T*E*R
(Officer Walter "Radar" O'Reilly)
The Good Guys
The Love Boat
(Donald Flanders)
Tales of the Unexpected
(Harry Flock)
Donny & Marie
(Self)
Wonder Woman
(Alan)
Sweepstakes
Pets: Part of the Family
M*A*S*H
(Radar O'Reilly)
Dinah!
(Self)
Hollywood Squares
(Self - Panelist)
CHiPs
(Gary Burghoff (uncredited))
Burke's Law
(Patrick Noyes)
AfterMASH
(Radar O'Reilly)
The Love Boat
(Eddie Martin)