How many movies have James Mather and Paul Riddle collaborated on?

They have worked on 2 movies together! Their first movie together was Birth (2004) while their highest rated movie together was Harry Potter and the Half-Blood Prince (2009). They have not worked together since Harry Potter and the Half-Blood Prince (2009).

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Supervising Sound Editor
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Visual Effects Supervisor
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Supervising Sound Editor
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Digital Compositor