Ratatouille had a single screenwriter.
Ratatouille (film) . It is the eighth film produced by Pixar and was co-written and directed by Brad Bird , who took over from Jan Pinkava in 2005 . Development of Ratatouille began in 2000 when Pinkava wrote the original concepts of the film . In 2005 , Bird was approached to direct the film and revise the story .