Cynthia was born in New York City, New York in 1934.
She is most well known for her roles in L.A. Law, Edward and Mrs. Simpson and Mad About You.
Her Broadway debut was in 1963 and in 1971 she appeared on Broadway in the Landmark Stephen Sondheim-George Furth musical "Company".
She is a founding member and the co-Artistic director of The Actor's Company Theatre.
She received a BAFTA nomination in 1978 for her performance as Wallis Simpson in "Edward and Mrs. Simpson".