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Augusta Marsh Birney (born July 27, 1999), known professionally as Gus Birney, is an American actress. She is known for her television roles in The Mist (2017), Dickinson (2019–2021), and Shining Vale (2022–2023). On stage, she made her Broadway theatre debut in the 2023 revival of The Sign in Sidney Brustein's Window. She also acted in off-Broadway productions of The Rose Tattoo (2016) and Our Class (2024).
From February to March in 2023 she acted in the off-Broadway revival of Lorraine Hansberry's The Sign in Sidney Brustein's Window starring opposite Oscar Isaac and Rachel Brosnahan at the Brooklyn Academy of Music. She played a young prostitute, Gloria Parodus, the sister of Iris (Brosnahan). The production made its transfer to Broadway theatre with Birney joining making it her Broadway debut. Birney said of the experience, "Doing Sidney Brustein was one of the most transformative experiences of my life, not only as an actor, but as a human being. Anything after feels almost like, "OK, I know I can do this. I just went through something hard, and I have taught my soul how to handle going to a really dark place." David Gordon of TheatreMania described her performance as being "excellent". The production was nominated for the Tony Award for Best Revival of a Play losing to the revival of Topdog/Underdog.
In 2024, she acted in the adaptation of the Poland playwright Tadeusz Slobodzianek's play Our Class at the Brooklyn Academy of Music. She portrays Dora, a young Jewish mother, one of 10 Polish students in the time leading up to a 1941 pogrom in the Jedwabne pogrom. Raven Snook of Time Out described her performance as "heartbreaking".
| 2012 | Bloody Mary | Victoria | Short film |
| 2018 | Here and Now | Lucie | |
| Whiteboy | Brandy | Short film | |
| Swallow Grass Snakes | Devin | Short film | |
| 2019 | Afterdeath | Short film | |
| 2020 | Darcy | Darcy | |
| I'm Thinking of Ending Things | Tulsey Town Girl 2/Aunt Eller | ||
| The Man in the Woods | Suzie Hall | ||
| 2021 | Plan B | Megan | |
| Giving Birth to a Butterfly | Marlene | ||
| 2023 | Happiness for Beginners | Kaylee | |
| Asleep in My Palm | Millah | ||
| Three Birthdays | Joyce |
| 2015 | Chicago Med | Ashley Cole | Episode: "Mistaken" |
| 2017 | The Mist | Alex Copeland | 10 episodes |
| Kristi Martin | Episode: "Unintended Consequences" | ||
| 2018 | Instinct | Nicki | Episode: "Secrets and Lies" |
| Bull | Penny Spiro | Episode: "Jury Duty" | |
| 2019 | Jessica Jones | Birdie | Episode: "A.K.A. You're Welcome" |
| Blue Bloods | Carrie Ross | Episode: "The Real Deal" | |
| Insatiable | Jade | Episode: "Ladybomb" Episode: "The Most You Can Be" | |
| 2019–2021 | Dickinson | Jane Humphreys | 17 episodes |
| 2020 | The Blacklist | Angela Hendrickson | Episode: "Nyle Hatcher" |
| 2022–2023 | Shining Vale | Gaynor Phelps | 16 episodes |
| 2025 | Black Rabbit | Mel Whitney | Miniseries |
| 2025 | The Last Frontier | Vivian | Episode: "American Dream" |
| 2026 | Something Very Bad Is Going to Happen | Portia Cunningham | 8 episodes |
| 2016 | The Rose Tattoo | Rosa | Tennessee Williams | Williamstown Theatre Festival | |
| Connected | Girl Making Out/Jill/Shireen | Lia Romeo | 59E59 Theatres, Off-Broadway | ||
| 2023 | The Sign in Sidney Brustein's Window | Gloria Parodus | Lorraine Hansberry | Brooklyn Academy of Music | |
| James Earl Jones Theatre, Broadway theatre | |||||
| Paris, ACTORS! | Performer | Hamish Linklater | Reading, Williamstown Theatre Festival | ||
| 2024 | Our Class | Dora | Tadeusz Slobodzianek | Brooklyn Academy of Music |
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