Early life Edit
Geeson was born in Arundel, Sussex. She came from a middle-class family; her father edited the National Coal Board magazine. Her sister, Sally Geeson, also an actress, is known for her roles in British television sitcoms of the 1970s. Geeson attended Corona Stage Academy, making her stage debut in 1957.
Geeson's first major film appearances came in 1967 with To Sir, with Love (alongside Sidney Poitier and pop singer Lulu), and the comedy Here We Go Round the Mulberry Bush. The following year, she appeared in Berserk!, co-starring Joan Crawford. Geeson became well known as a result of a regular role in the BBC early-evening soap opera, The Newcomers. She also had a major role in the 1970s costume drama Poldark, as Caroline Penvenen Enys.
Her other notable films include Prudence and the Pill (1968), Three Into Two Won't Go (1969), 10 Rillington Place (1970), Doomwatch (1972), Brannigan (1975; co-starring John Wayne, with whom she enjoyed working) and The Eagle Has Landed (1976). In the TV series Danger UXB, she played the female lead, Susan Mount, opposite Anthony Andrews. She also had the lead role of Fulvia in the science-fiction series Star Maidens.
In 1984, Geeson left London for Los Angeles, California, where she decided to stay. Among other roles, she appeared regularly in the American sitcom Mad About You as the hostile neighbour, Maggie Conway. She also played the role of Sandrine in the Star Trek: Voyager episodes "Twisted" and "The Cloud".
Having always been interested in antiques, Geeson managed an antique store, Blanche & Co, on West 3rd Street in Beverly Hills, in addition performing in occasional acting roles. After ten years of business, the store closed in December 2009.
Having appeared in a number of horror films during the 1970s and 1980s, including It Happened at Nightmare Inn (1973), Dominique (1978) and Inseminoid (1981), Geeson returned to the horror genre in The Lords of Salem (2012), directed by Rob Zombie. The film marked a return to acting following a nine-year absence.