Marilyn Mawn was born on August 25, 1899 in Duddesdon, Birmingham, England as Margaret Alice Capener. She was an actress, known for Account Rendered (1932) and Captivation (1931). She was married to Flight Lieutenant James Alphaeus Glen DSC RAF and Count J E G O'Byrne. She died on June 22, 1962 in Buckinghamshire, England.