Her additional work in daytime television includes her portrayals of Dr. Althea Davis on The Doctors, for which she was the first recipient of a Daytime Emmy for Outstanding Lead Actress, and Edith Wilson in First Ladies' Diaries, which earned her an additional Daytime Emmy. Hubbard also appeared in the PBS production Ceremony of Innocence.

Hubbard's numerous Broadway credits include The Physicists, for which she received the Clarence Derwent Award, Joe Egg and Children! Children! She also appeared at Circle in the Square in Ibsen's John Gabriel Borkman and opposite George C. Scott in Noel Coward's Present Laughter. She has had roles in the musicals Dance a Little Closer, I Remember Mama with Liv Ullmann, and A Time for Singing, and has appeared in both Broadway and touring productions of Look Back in Anger.

Off Broadway, she appeared in War and Peace, The Boys from Syracuse and The Threepenny Opera. Her additional theater credits, in locations other than New York City, include Blithe Spirit, Uncle Vanya and Macbeth.

On film, Hubbard can be seen in Ordinary People, The Bell Jar and I Never Sang for My Father.

After graduating cum laude from Radcliffe, the New York City-born Hubbard pursued her theatrical education at the Royal Academy of Dramatic Art in London, where she was the first American to receive the school's silver medal. She studied acting with Harold Clurman and Lee Strasberg in New York and has studied singing all her life.

Hubbard lives in New York City. She has one son, Jeremy Bennett. Hubbard sits on several boards for international humanitarian causes, and enjoys writing and traveling. Her birthdate is December 22.