How many movies have Richard P. Rubinstein and Salah M. Hassanein collaborated on?

They have worked on 3 movies together! Their first movie together was Knightriders (1981) while their highest rated movie together was Day of the Dead (1985). They have not worked together since Day of the Dead (1985). They are most known for their drama films together.

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Bearded Party Guest (segment "The Crate")
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Crowd Member Holding Baby on His Shoulders (uncredited)