How many movies have Peter Jackson and William Kircher collaborated on?

They have worked on 3 movies together! Their first movie together was The Hobbit: An Unexpected Journey (2012) while their highest rated movie together was The Hobbit: The Desolation of Smaug (2013). They have not worked together since The Hobbit: The Battle of the Five Armies (2014). They are most known for their adventure films together.

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Bifur
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Painting of Bungo Baggins (uncredited)
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Bifur
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Albert Dreary (uncredited)
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Bifur / Tom Troll
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Running Dwarf in Erebor (uncredited)