Gillian Anderson. Actress: The X Files. Gillian Anderson was born in Chicago, Illinois, to Rosemary Alyce (Lane), a computer analyst, and Homer Edward Anderson III, who owned a film post-production company. Gillian started her career as a member of an amateur actor group while at high school. In 1987, her love of the theatre took her to the National Theatre of Great Britain Summer Acting Programme held at Cornell University...