Joanna Roos was an American Broadway, radio, and television actress and a playwright. She was born in Brooklyn and attended Syracuse University as well as Yvette Guilbert's School in New York and Paris.
In 1930 Roos performed the role of Sofya Alexandrovna in a classic performance of the Anton Chekhov play \"Uncle Vanya\" at the Cort Theatre in New York City, a production that one critic called \"unforgettable\". The show ran for seventy-one performances.
She retired in 1978 from her role as Sarah Dale Caldwell McCauley on the soap opera Love of Life. She had played the role from 1968-1978, which marked her second role on the series, which became her best known role. In 1955-1957, she had originally played the role of compassionate Althea Raven, the first mother in-law of heroine, Vanessa Dale.
She was a founding member of the New Dramatists Committee. Several of the plays she wrote for the group won awards.