Painter of hard-edged, tonal abstract works, sculptor, printmaker, teacher and art critic whose pictures incorporated visual ambiguity and humour. Among the practitioners Ron Sims admired were the Cubist painter and sculptor Georges Vantongerloo and architect Frank Gehry, Dutch 1920s De Stijl movement and American 1960s hard-edge artists. Ron Sims began a four-year diploma course at Colchester School of Art in 1961, completing a one-year postgraduate course at Manchester School of Art in 1965, followed by three years’ postgraduate studies at the Royal Academy Schools, 1967–70, where the teacher Roderic Barrett was an influence. Sims was awarded a one-year teaching fellowship at Gloucester College of Art, 1970. He was a part-time adult lecturer at Braintree Community Centre and art mentor for trainee teachers in art, Homerton College, also a Colchester Art Society selector and a committee member for it and Gainsborough’s House Print Workshop.