Kathleen Byron trained for the stage at the Bristol Old Vic Theatre School, beginning her work in the movies soon after she finished her training. Her early work with Michael Powell made her name in the UK. She went to Hollywood in the 1940s and 50s but found it difficult to break into the US productions. Mainly because although everyone greatly admired her performance as Sister Ruth in Black Narcissus (1947), she was typecast and only expected to be able to play neurotic characters.