How many movies have David Farmer and Peter Jackson collaborated on?

They have worked on 7 movies together! Their first movie together was The Lord of the Rings: The Fellowship of the Ring (2001) while their highest rated movie together was The Lord of the Rings: The Return of the King (2003). 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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Painting of Bungo Baggins (uncredited)
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Albert Dreary (uncredited)
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Running Dwarf in Erebor (uncredited)
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Biplane gunner
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Corsair Bosun (uncredited)
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Spear-Throwing Rohan Soldier (uncredited)
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Albert Dreary / Painting of Bungo Baggins (uncredited)