Marielle Stiles Heller /ˈmɑːriɛl/ (born October 1, 1979) is an American writer, director, and actress. She is best known for directing the films The Diary of a Teenage Girl (2015), Can You Ever Forgive Me? (2018), and A Beautiful Day in the Neighborhood (2019), as well as acting in The Queen’s Gambit (2020).
Marielle Stiles Heller was born in Marin County, California, to Steve Heller, a chiropractor, and Annie Stiles-Heller, an artist and art teacher. She grew up in nearby Alameda, along with her younger brother and sister, Nate and Emily. Her father hails from a Jewish family in New York. Heller started off as an actor, calling acting her "first love." She was part of the Alameda Children's Musical Theater, where she participated in as many as four plays a year, including the roles of Rabbit in Winnie the Pooh, Templeton the rat in Charlotte’s Web, and Polly in The Magician's Nephew.
With time, she graduated to community theater, as well as productions at Saint Joseph Notre Dame High School. She graduated in 1997. She studied theatre at UCLA and then at the Royal Academy of Dramatic Art in London. Additionally, she was honored with a Lynn Auerbach Screenwriting Fellowship and The Maryland Film Festival Fellowship.

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