Geer began her film career appearing as a nun in the 1968 Richard Lester drama Petulia.

Television series on which she appeared during this time included Police Story, The Streets of San Francisco, Baretta,[5] Barnaby Jones, Charlie's Angels, CHiPs and two episodes of Fantasy Island.

Her television movie credits during this time included Babe (1975),[6] The Lindbergh Kidnapping Case (1976), The Trial of Lee Harvey Oswald (1977) and A Shining Season (1979).

The remainder of her television credits include guest appearances in the Star Trek: The Next Generation episode "Silicon Avatar", The Waltons,[7] Quincy, M.E., Dallas, The Practice, Stingray, CSI: Crime Scene Investigation, ER, NYPD Blue and Cold Case.

[8] Geer has also served as a visiting associate professor, teaching acting, at the University of California, Los Angeles School of Theater for 12 years.