Development of "The Lion King" began in 1988 during a meeting between Jeffrey Katzenberg, Roy E. Disney, and Peter Schneider while promoting "Oliver & Company" in Europe. Thomas M. Disch wrote a film treatment, and Woolverton developed the first scripts, while George Scribner was signed on as director, being later joined by Allers. Production began in 1991 concurrently with "Pocahontas", which wound up attracting many of Disney's top animators. Some time after the staff traveled to Hell's Gate National Park in Kenya to research the film's setting and animals, Scribner left production, disagreeing with the decision to turn the film into a musical, and was replaced by Minkoff. When Hahn joined the project, he was dissatisfied with the script and the story was promptly rewritten. Nearly 20 minutes of animation sequences were produced at the Disney-MGM Studios theme park in Florida. Computer animation was also used in several scenes, most notably in the wildebeest stampede sequence.