In September 1941, Brook debuted on stage in Lottie Dundass in Santa Barbara.
Her Broadway credits include The Cocktail Party (1949), You Never Can Tell (1947), and Letters to Lucerne (1941).
Brook portrayed Julia Naughton in the American television series Claudia (1952). In Britain, she appeared on War and Peace on the BBC and The Irish RM on Channel 4, among other programs.
She also appeared on stage in The Colour of Poppies and in Uncle Vanya in 2008.
Brook was married to — and divorced from — first Charles Moffett and later Michael Horowitz. She had a son with Horowitz.