Siân Heder (/ˈʃɑːn ˈheɪdər/; born June 23, 1977) is an American filmmaker who is best known for writing and directing the films Tallulah and CODA. CODA earned Heder an Academy Award for Best Adapted Screenplay and a BAFTA Award for Best Adapted Screenplay. The film also won the Academy Award for Best Picture and the Academy Award for Best Supporting Actor for Troy Kotsur.

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