Experimental, Expressionist ceramic sculptor, draughtsman, printmaker and teacher, born in Staffordshire, both parents from Scottish medical families, his father the doctor in a lunatic asylum. After failing to obtain a short-service commission, Henderson did his National Service in the Royal Air Force Regiment in Germany, on release working for a chemical company. Based in Cardiff, Henderson visited museums and attended evening art classes; joined the Barry Summer School, meeting Harry Thubron, Terry Frost and Kenneth Martin; then studied at Goldsmiths’ College, 1964–5, and Camberwell School of Arts and Crafts, 1965–8, tutors including Hans Coper and Lucie Rie. Henderson rebelled against symmetrical conformity and the art/craft gap; he built vessels instead of using a wheel, and eventually employed a mix of clays and paper pulp.