Susan Blackwell is an American actress in the front rank of the profession with the kind of reach that turns a role into a reference point. 'The Post' sits alongside it on the filmography. 33 was the age at the first credit. 29 titles is a lot of work for the level of visibility involved. her Intermission Woman in 'Birdman or (The Unexpected Virtue of Ignorance)' is the role the wider public knows.