This petite blonde stage-trained Irish actress is best-known for her work on the London stage with the Royal Shakespeare Company (RSC) and the Royal Court Theatre. The daughter of noted actor Cyril Cusack, she began her professional career at the famed Abbey Theater of Dublin. In the late 1960s, Cusack moved to London and soon thereafter began her collaboration with the RSC. She also made her feature debut with a small part in Clive Donner's "Alfred the Great" (1969). The next year, she starred opposite Peter Sellers in the small comedy "Hoffman" but for the better part of the next two decades, she concentrated on working in the theater.