Buster Keaton
Robert Z. Leonard
Wesley Ruggles
Lloyd Bacon
Norman Taurog
Jack Conway (filmmaker)
William A. Seiter
Norman Z. McLeod
Edward F. Cline
Mack Sennett
John G. Blystone
Irving Cummings
Frank Borzage
George Marshall (director)
Slim Summerville
Charley Chase
Clarence Badger
Mervyn LeRoy
Sam Wood
Richard Wallace (director)
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Robert Zigler Leonard (October 7, 1889 – August 27, 1968) was an American film director, actor, producer, and screenwriter. Wikipedia