In 2001, Keller appeared in an all-star Broadway adaptation of Abby Mann's play Judgment at Nuremberg, directed by John Tillinger, as Mrs. Bertholt, in the role played by Marlene Dietrich in the 1961 Stanley Kramer film version.
Keller made her stage debut in 2001 as Mrs. Bertholt in a notable production of Abby Mann's play Judgment at Nuremberg, which was directed by John Tillinger and featured an all-star cast, a role previously played by Marlene Dietrich in the 1961 film.