Halley Gross

Halley Wegryn Gross (born December 27, 1985) is an American screenwriter and actress. She is best known for writing two 2016 episodes of the HBO series Westworld and co-writing the 2020 video game The Last of Us Part II.

Early life Halley Wegryn Gross was born in Sanibel, Florida, She attended the Gallatin School of Individualized Study at New York University (NYU) as an undergraduate.

Career

Acting Gross worked as an actress and appeared onstage in a 2005 production of Hurlyburly, a 2011 production of The Metal Children, and a 2012 production of A Midsummer Night's Dream.

Writing She had her breakthrough as a writer and story editor for two 2016 episodes of the HBO television series Westworld. She was also a writer for two episodes of the 2019 Amazon miniseries Too Old to Die Young. The game won multiple awards, some of which were awarded to Gross and Druckmann for their writing. Gross joined the writers' room of the second season of the television adaptation of The Last of Us, which adapts part of the events of The Last of Us Part II. She co-wrote the sixth and seventh episodes with Druckmann and Craig Mazin. Gross stepped away from writing duties on the HBO series in July 2025.

Filmography Film

Television