Career
She was noted for her research into French drama. She taught at Liverpool University from 1934 to 1967. Knowles is known to historians of British cinema for her 1934 book The Censor, the Drama and the Film, in which she criticised the British Board of Film Censors for what she regarded as unaccountable political censorship.
In 1989 she published a study of the work of the playwright Armand Gatti.
