My cousin, Ruth Artmonsky, who has died aged 94, was a pioneer in the commercial use of psychometric testing. Together with her second husband, Roger Holdsworth, and their associate Peter Saville, she was a founder in 1977 of the consultancy Saville & Holdsworth (later SHL), which started in their living room and went on to become a global corporation with offices in 30 countries.
After selling her share in the company in 1997, Ruth used her self-taught knowledge of the arts to set up and run her own gallery, Artmonsky Arts, in St John’s Wood, north London, for five years, before turning to writing. Her 36 books about art, design and advertising included Designing Women (2012) and Modern Design in 1930s Britain (2026).