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In page Fred Zinnemann:

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He was among the first directors to insist on using authentic locations and for mixing stars with non-professional actors to give his films more realism. Within the film industry, he was considered a maverick for taking risks and thereby creating unique films, with many of his stories being dramas about lone and principled individuals tested by tragic events. According to one historian, Zinnemann's style demonstrated his sense of "psychological realism and his apparent determination to make worthwhile pictures that are nevertheless highly entertaining."[citation needed]