Maggie Siff is an American actor best known for her seven-season run as Wendy Rhoades in Showtime’s Billions, earning three Satellite Award nominations. Her acclaimed television work also includes Sons of Anarchy (two Critics’ Choice Award nominations) and Mad Men (Screen Actors Guild Award nomination) where she portrayed Rachel Menken.

Maggie recently played Joy Davidman opposite Hugh Bonneville in Shadowlands at the Aldwych Theatre in London.

On film, Siff has appeared in The Short History of the Long Road, A Woman/A Part, The Sweet Life, The Fifth Wave, One Percent More Humid, and Concussion.

A seasoned theatre performer, Siff has starred Off-Broadway in Creditors at the Minetta Lane Theatre opposite Liev Schreiber (directed by Ian Rickson), Breaking the Story at Second Stage, and Orpheus Descending and The Taming of the Shrew at Theatre for a New Audience. Her stage credits also include Curse of the Starving Class (Signature Theatre) and A Lie of the Mind (The New Group, directed by Ethan Hawke).

She lives in New York.

Shadowlands ran from 5 February until 9 May 2026.

Maggie Siff Links & Socials
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Main photo: Maggie Siff. Photo by Bryce Duffy courtesy of agent

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