He co-wrote The Descendants (2011) alongside Alexander Payne and Nat Faxon, for which they received the Academy Award, Independent Spirit Award and Writers Guild of America Award for Best Adapted Screenplay. They were also nominated for the BAFTA, Golden Globe, and Critics' Choice Movie Awards. Rash has since, with Faxon, written and directed the comedy films The Way, Way Back (2013) and Downhill (2020).
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