Susannah's latest project is a new television show from ITV Productions, called Perfect Parents, reported to be filming in 2006.
Susannah played Miss Jane Bennet in the BBC's 1995 dramatization of Pride and Prejudice for TV. Her mother, Polly Adams, played the same character in the BBC's previous Pride and Prejudice (1967).
Susannah's great-great-great-grandfather (in early Victorian London) was an actor called William Pierpoint Harker.
Susannah was an active campaigner for the Stop the War Coalition, which argued against the American and British invasion of Iraq in 2002-03.
She was nominated for a BAFTA Award (Best Actress) in 1991 for House of Cards.
The hero of Bram Stoker's book Dracula, Jonathan Harker, is said to have been named after the writer's friend Joseph Harker (1856-1927), a scene-painter and theatrical designer who was Susannah's great-great-grandfather.
Susannah has one son, called Finlay Glen.
Susannah Harker: Supporting the anti-war campaign was a moral stance for me. If this is about producing weapons of destruction, America is the worst culprit and they should be dealt with first. We should be dealing with this politically. It is very, very dangerous and war is a bad idea. (said as part of a Stop the War coalition delegation to number 10, Downing Street, in September, 2002)