Gillian Leigh Anderson OBE (born August 9, 1968) is an American actress, writer, and activist. She is best known for her roles as FBI Special Agent Dana Scully in the sci-fi series The X-Files (1993–2002; 2016–2018), Lily Bart in the drama film The House of Mirth (2000), DSI Stella Gibson in the BBC/RTÉ crime drama series The Fall (2013–2016), Jean Milburn in the Netflix comedy-drama series Sex Education (2019–2023), and Margaret Thatcher in the fourth season of the Netflix drama series The Crown (2020). She has won two Primetime Emmy Awards, two Golden Globe Awards, and four Screen Actors Guild Awards.