Geeson was born in Arundel, Sussex on September 10, 1948. She came from a middle class family, and her father edited the National Coal Board magazine. Her sister, Sally Geeson, is also an actress and is known for her roles in British television situation comedies in the 1970s. Geeson attended Corona Stage Academy, making her stage debut in 1957.

Her first major film appearance was as wayward teenager Pamela Dare in To Sir, With Love in 1967 alongside Sidney Poitier and popular singer Lulu (who performed the theme song), but she 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 popular 1970s costume drama Poldark as Caroline Penvenen Enys. She has since appeared Read more...

In 1984, Geeson left London for Los Angeles where she decided to stay. She was married to the actor Kristoffer Tabori from 1985 until 1989. Among other roles she appeared regularly on hit US sitcom Mad About You as neighbour from Hell, Maggie Conway. She also had a reoccurring role as "Sandrine" on Star Trek Voyager. Having always had an interest in antiques, she now runs her own antique store, Read more...