Sculptor, born in Richmond, Surrey, as Arthur George Mackenzie. Was married to the painter Eileen Guthrie, one of their five children being the photographer Nicholas Mackenzie. Kennethson studied painting at Royal Academy Schools, 1928–34, turning to sculpture in 1937. Kennethson carved stone directly, using only simple sculptural drawings. The nature of the stone influenced his idea of what the finished work would be. His constant subject matter was birds, plants, heads, sky and sea, and his style, influenced by Gaudier-Brzeska and Brancusi, changed little. Much of his work was modest in size. He was an infrequent exhibitor, but had retrospectives at University of Birmingham, 1974; New Art Centre, 1988; and Pallant House, Chichester, 1993.