mˈæk mˈʌlən wʌzɐ sˈiːkwəns dᵻɹˈɛktɚɹ ɔnðə sˈɪmpsənz mˈuːvi, ænd ɪn tˈuː θˈaʊzənd nˈaɪn ʃiː wʌzɐ mˈɛmbɚɹ ʌvðə pˈɪksɑːɹ tˈiːm wˈɜːkɪŋ ɔnðɪ ˈænɪmˌeɪɾᵻd fˈɪlm nˈuːt pɹˈaɪɚ tʊ ɪts kˌænsɪlˈeɪʃən.
MacMullan was a sequence director on The Simpsons Movie, and in 2009 she was a member of the Pixar team working on the animated film Newt prior to its cancellation.