English photographer and collagist, born in London, and died in Thorpe-le-Soken, Essex. He studied biology at Chelsea Polytechnic in London (1935–6) and then worked as an assistant to Helmuth Ruhemann (1936–9). In the later 1930s he produced paintings and collages influenced by Yves Tanguy. After serving as a pilot in World War II, he studied at the Slade School of Fine Art in London (1945–9). There he befriended Eduardo Paolozzi, with whom he visited Paris, meeting Brancusi, Léger, Giacometti, Braque and Arp. In other photographs of the period he achieved unusual effects by altering negatives or by placing objects directly on light-sensitive paper to create photograms. He was associated with the INDEPENDENT GROUP on its foundation in 1952, and with Paolozzi and others he participated in the Parallel of Life and Art exhibition at the ICA in London in 1953 and also in the pioneering Pop art exhibition This Is Tomorrow at the Whitechapel Art Gallery in London in 1956. After his first major one-man show at the ICA in 1961, Henderson began colouring some of his photographs with paint. From 1965-68 and 1972-82 he ran the photography department at the Norwich School of Art while continuing his own photographic work.