Hannah Marks (born April 13, 1993)^[1] is an American actress, writer, and director.^[2] She played Amanda Brotzman on the television series Dirk Gently's Holistic Detective Agency.

Hannah Marks was born in Los Angeles,^[3] the daughter of Robin Marks and Nova Ball, a former actress, and grew up in San Luis Obispo, California.^[4] Hannah's maternal grandfather was entrepreneur and musician Ernie Ball, and one of her maternal great-great-grandfathers was composer Ernest Ball.^[4][5]

Marks appeared in the 2006 feature film Accepted as Lizzie Gaines. She has guest-starred in television programs such as Ugly Betty and Weeds. She was featured in the cover story of the June 4, 2006 issue of The New York Times Magazine with her friend Liana Liberato.^[6]

Marks played Tammy in The Runaways, a 2010 biographical film about the 1970s all-girl rock band of the same name.^[7]

She has been nominated twice for a Young Artist Award, first for her performance in the film Accepted, and again for her performance in the television series FlashForward.^[8][9]

Marks starred as Amanda Brotzman in the BBC America original Dirk Gently's Holistic Detective Agency.

In July 2017, Marks was named one of Rolling Stone's 25 Under 25 Artists Changing the World.^[10]

In January 2019, she was named as the director for an upcoming film adaptation of the John Green novel Turtles All the Way Down.^[11] This adaptation is scheduled to release on May 2, 2024 on the streaming service Max.^[12]

In March 2021, she was named as the director for the Amazon Studios film Don't Make Me Go starring John Cho.^[13]