Williams was a member of improv comedy troupe "Just Add Water", before acting in the YouTube series "College Musical'.
Judd Apatow cast Williams in the HBO series "Girls", followed by the title role on NBC's live television presentation of the musical "Peter Pan Live!", opposite Chris Walken as 'Captain Hook'.
In 2016, Williams appeared in "Past Forward", a short film collaboration between David O. Russell and Prada.
Williams wrote a series of "Funny or Die" sketches starring as newlywed 'Kate Middleton'.
In 2017, Williams starred in the horror film "Get Out", directed by Jordan Peele. Williams was cast as 'Charlotte' in the Netflix horror feature "The Perfection" (2019).
She was cast as 'Kit Snicket' in the second and third seasons of "A Series of Unfortunate Events", followed by the Swedish thriller "Horizon Line" (2020).
Williams currently stars in the Blumhouse Productions feature "M3GAN".
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