His career spanned films from The Turmoil in 1924 to The Fortune Cookie in 1966.
He was nominated for an Academy Award in the category Best Art Direction for the film The Fortune Cookie.
In the 1965 film The Fortune Cookie, Harry Hinkle (Jack Lemmon) carries a hardcover copy of the novel into his bedroom.
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Ruman continued his trend of playing over-the-top German characters later in his career for Lubitsch's protege Billy Wilder, appearing in Wilder's films The Emperor Waltz, Stalag 17 and The Fortune Cookie.