American theatre director, actor. (1906-1994). The source from which America's tradition of theatrical improvisation springs. Her theatre games that she invented for a drama workshop for the Works Projects Administration are still staples of acting classes, creative drama, and improv workshops. They were designed to teach theatre skills across cultural, ethnic, and age boundaries. Her 1963 book Improvisation for the Theatre, is still in print and required reading for all drama teachers. With her son, Paul Sills, her teachings had a profound influence on Second City, and a generation of American comedians.