How many movies have Daniel S. Kaminsky and Joss Whedon collaborated on?

They have worked on 3 movies together! Their first movie together was Much Ado About Nothing (2013) while their highest rated movie together was Avengers: Age of Ultron (2015). They have not worked together since Justice League (2017). They are most known for their adventure films together.

Justice League (2017)

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Executive Producer
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Screenplay

Avengers: Age of Ultron (2015)

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Associate Producer
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Director
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Writer

Much Ado About Nothing (2013)

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Co-Producer
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Director
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Editor
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Screenplay
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Producer
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Original Music Composer
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Editor