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Mattinson was a storyboard artist for the 1977 film "The Rescuers". He also has story credits for "The Fox and the Hound" (1981), "Mickey's Christmas Carol" (1983), "The Black Cauldron" (1985), "The Great Mouse Detective" (1986), "Beauty and the Beast" (1991), "Aladdin" (1992), and "The Lion King" (1994).