Designer, painter, writer, printmaker, illustrator and teacher, born and lived in London. An interest in art and crafts was fostered at Roedean School, after which she attended Central School of Art for a year, then in 1922 went to Royal College of Art, where Paul Nash and Leon Underwood were influences. Joined Barron and Larcher textile printing studio, in 1927 starting own workshop, her moquette being used for many years on Underground trains. In 1931–3 taught wood engraving at Ruskin School, Oxford; in the 1960s she was head of the department of dress, textile and ceramics at Croydon College of Art. Marx wrote and illustrated children’s books; contributed to the Pilgrim Trust Recording Britain project; was a member of the Board of Trade Utility Furniture team; was elected a Royal Designer for Industry; worked on furnishing fabrics for Morton Sundour; and designed for Penguin Books, Festival of Britain, General Post Office, Shell and London Transport.