Susannah is the daughter of the English actress Polly Adams
and the sister of Caroline Harker
. She trained for her career at the Central School of Speech and Drama, London. While most of her acting now is on the stage, she has also had many television roles (see credits, below).
Outside her work, Susannah is an activist in a number of causes. She was one of the high-profile members of the British Stop the War Coalition, which campaigned against the Allied invasion of Iraq in 2002-03.
Susannah belongs to a long theatrical tradition. Her great-great-great-grandfather was an actor called William Pierpoint Harker, whose son Joseph Harker (1856-1927) was a scene painter in the London theatre. He was a friend of the writer Bram Stoker, who named the hero of Dracula (Jonathan Harker) after him. One of Joseph's sons was the veteran character actor Gordon Harker
(1885-1967), who was Susannah's great-great-uncle.
Susannah was previously married to the actor Iain Glen
, and they have one son, called Finlay, but Susannah and Iain are now divorced.
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