
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.

M*A*S*H
1970 · as Cpl. 'Radar' O'Reilly

Twigs
1975 · as The Priest

Altman on His Own Terms
2000 · as Self

M*A*S*H: 30th Anniversary Reunion
2002 · as Himself

M*A*S*H: The Comedy That Changed Television
2024 · as Self

Casino
1980 · as Bill Taylor

B.S. I Love You
1971 · as Ted

Making 'M*A*S*H'
1981 · as Self

The Man in the Santa Claus Suit
1979 · as Bob Willis

Memories of M*A*S*H
1991 · as Self / Radar O'Reilly

Enlisted: The Story of 'M*A*S*H'
2000 · as Self

Behind the Waterfall
1995 · as Mr. Connors

Daniel's Lot
2010 · as Pastor Mahoney

Small Kill
1992 · as Fleck / Lady Esmerelda

The Real M*A*S*H
2010 · as Himself

W*A*L*T*E*R
1984 · as Walter 'Radar' O'Reilly