Isaiah was involved in the theatre from his early childhood through the final year of his life. Read more about his work as an actor, from his boyhood in the Yiddish theatre to his comic, serious, and satiric roles throughout his life; as a director of Brecht, de Ghelderode, Singer, O’Casey, and many others; as a writer for stage, television, and film, including the book and lyrics for the musicals The Rise of David Levinsky and Yiddle with a Fiddle.