Gillian Leigh Anderson ( JIL-ee-ən; born August 9, 1968) is an American actress and writer. She received international fame for starring as FBI Special Agent Dana Scully in the Fox science fiction mystery series The X-Files (1993–2002; 2016–2018), winning a Primetime Emmy Award for the role. Her other credits include socialite Lily Bart in Terence Davies's film The House of Mirth (2000), DSU Stella Gibson in the BBC/RTÉ crime drama television series The Fall (2013–2016), sex therapist Jean Milburn in the Netflix comedy-drama Sex Education (2019–2023), and British Prime Minister Margaret Thatcher in the fourth season of Netflix drama series The Crown (2020), for which she earned her second Golden Globe and Primetime Emmy Awards.
Born in Chicago, Anderson grew up in North London in the UK and Grand Rapids, Michigan. She graduated from The Theatre School at DePaul University in Chicago, then moved to New York City to further her acting career. After beginning her career on stage, she achieved international recognition for her role in The X-Files (1993–2002). She reprised her role in the films The X-Files: Fight the Future (1998) and The X-Files: I Want to Believe (2008) as well as a revival series from 2016 to 2018. Her film roles include in The Mighty Celt (2005), The Last King of Scotland (2006), Shadow Dancer (2012), Viceroy's House (2017), Tron: Ares (2025), and Teenage Sex and Death at Camp Miasma (2026), with further television work playing Lady Dedlock in Bleak House (2005), Wallis Simpson in Any Human Heart (2010), Miss Havisham in Great Expectations (2011), Dr. Bedelia Du Maurier in Hannibal (2013–2015), and Media in American Gods (2017).
Aside from film and television, Anderson has taken to the stage and received awards and critical acclaim. Her stage work includes Absent Friends (1991), for which she won a Theatre World Award for Best Newcomer; A Doll's House (2009), for which she was nominated for a Laurence Olivier Award, and a portrayal of Blanche DuBois in A Streetcar Named Desire (2014, 2016), winning the Evening Standard Theatre Award for Best Actress and receiving a second Laurence Olivier Award nomination for Best Actress. In 2019, she portrayed Margo Channing in the stage production of All About Eve for which she received her third Laurence Olivier Award nomination.
Over her career she has received various accolades including two Primetime Emmy Awards, two Golden Globe Awards, and four Screen Actors Guild Award as well as nominations for three Laurence Olivier Awards. She was appointed an honorary Officer of the Most Excellent Order of the British Empire (OBE) in 2016 for her services to drama. Anderson has supported numerous charities and humanitarian organizations. She is an honorary spokesperson for the Neurofibromatosis Network and a co-founder of South African Youth Education for Sustainability (SAYes). She has resided in London since 2002, after earlier years divided between the United Kingdom and the United States.
Anderson was born in Chicago, Illinois, the daughter of Rosemary "Posie" Alyce (née Lane), a computer analyst, and later vice president of Neurofibromatosis Inc., the NF support group of West Michigan, and Homer Edward "Ed" Anderson III, who owned a film post-production company. She has described her upbringing as influenced by Buddhism. She is of English, German, and Irish ancestry. Soon after her birth, her parents moved to Puerto Rico for 15 months, then to London, England. The family relocated so that her father could attend the London Film School. With her parents, she lived in north London's Crouch End and Haringey. She was a pupil of Coleridge Primary School. When Anderson was 11 years old, her family returned to the United States, settling in Grand Rapids, Michigan. They continued to keep a flat in London and spent their summers there. Anderson later said that she had always intended to return to England. In Grand Rapids, she attended Fountain Elementary and City High-Middle School, a program for gifted students with a strong emphasis on the humanities.
Following the move to Grand Rapids, Anderson went through a rebellious stage; taking drugs, dating a much older boyfriend, and cultivating a punk appearance (dyeing her hair various colors, shaving the sides of her head, sporting a nose piercing and an all-black wardrobe). She was put in therapy at the age of 14. Anderson listened to bands such as Dead Kennedys and Skinny Puppy. She was voted by her classmates as "class clown", "most bizarre girl" and "most likely to be arrested". She was arrested on graduation night for breaking and entering into her high school in an attempt to glue the locks of the doors. She later managed to reduce the charges to trespassing.
At an early age, Anderson was interested in marine biology, but after becoming interested in theatre during her teenage years, she began acting in high school productions during her first year and later in community theatre. She also served as a student intern at the Grand Rapids Civic Theatre & School of Theatre Arts. After graduating from high school in 1986, she attended The Theatre School at DePaul University in Chicago, where she earned a Bachelor of Fine Arts in 1990. Anderson also participated in the National Theatre of Great Britain's summer program at Cornell University. To support herself financially during her student years, she worked at the Goose Island Brewpub in Chicago. After Anderson became famous, the brewery named one of their beers after her, a Belgian-style farmhouse ale called "Gillian".
Anderson is the eldest of three siblings. Her brother Aaron – who was diagnosed with neurofibromatosis – died in 2011 of a brain tumor, at the age of 30. Aaron was a DJ, a mentor, and a practicing Buddhist. He was in his second year of a PhD program in developmental psychology at Stanford University when he was diagnosed with glioblastoma in 2008. Her sister Zoe is a ceramicist, whom Anderson called "an exceptional artist".
Anderson is bidialectal. With her English accent and background, she was mocked and felt out of place in the American Midwest and soon adopted a Midwestern accent. To this day, she easily shifts between her American and English accents. In May 2013, during an interview with the Milling About podcast, Anderson addressed the matter of her national identity: "I've been asked whether I feel more like a Brit than an American and I don't know what the answer to that question is. I know that I feel that London is home and I'm very happy with that as my home. I love London as a city and I feel very comfortable there. In terms of identity, I'm still a bit baffled."
Anderson moved to New York when she was 22 years old, and worked as a waitress to support herself. She began her career in Alan Ayckbourn's play Absent Friends at the Manhattan Theatre Club alongside Brenda Blethyn; for her role she won the 1990–91 Theatre World Award for "Best Newcomer". Her next theatrical role was in Christopher Hampton's The Philanthropist at the Long Wharf Theatre in New Haven, Connecticut.
Anderson moved to Los Angeles in 1992 and spent a year auditioning. The same year, she appeared in her first feature-length film, The Turning, starring Karen Allen and Tess Harper. The film drama is an adaptation of the play Home Fires Burning.
Although she had once vowed she would never do television work, being out of work for a year changed her mind. Anderson recalled: "First of all, I swore I'd never move to Los Angeles, and once I did, I swore I'd never do television. It was only after being out of work for almost a year that I began going in [to auditions] on some stuff that I would pray that I wouldn't get because I didn't want to be involved in it." She broke into mainstream television in 1993 with a guest appearance on the collegiate drama, Class of '96, on the fledgling Fox Network.
As a result of this guest appearance, Anderson was sent the script for The X-Files. She was 24 when she decided to audition because, "for the first time in a long time, the script involved a strong, independent, intelligent woman as a lead character." Producer Chris Carter wanted to hire her, but Fox wanted someone with previous television exposure and greater sex appeal. Fox sent in more actresses, but Carter stood by Anderson, and she was eventually cast as FBI Special Agent Dana Scully. Filmed for the first five seasons in Vancouver, British Columbia, before moving to Los Angeles, California, the series ran for nine seasons. Two related films were also produced, released in 1998 and 2008. During her time on The X-Files, Anderson won numerous awards for her portrayal of Special Agent Scully, including an Emmy Award for Outstanding Lead Actress in a Drama Series, a Golden Globe Award for Best Actress in a Television Series Drama, two Screen Actors Guild Awards for Outstanding Performance by a Female Actor in a Drama Series and a Saturn Award for Best Actress on Television. Anderson is the first actress to win an Emmy, a Golden Globe, and a SAG Award in the same year. For the role, she received a total of four Emmy nominations, four Golden Globe nominations and nine SAG nominations.