Hitchens studied briefly at St John’s Wood School of Art (1911), and then at the Royal Academy Schools 1912-19. He was a founder-member of the avant-garde
7 & 5 group in 1919, and exhibited with the London Group in the 1920s and 30s. He had his first solo exhibition at the Mayor Gallery in 1925. Hitchens’s life changed utterly in 1940 when a bomb exploded next to his studio in London. He and his wife moved to a caravan in woodland near Midhurst, Sussex. Over the years the caravan was gradually extended, and became Hitchens’ home and workplace for the rest of his life. He adopted the landscape of West Sussex as his main subject, often painting out of doors.
In 1945 Hitchens had a retrospective exhibition at Leeds City Art Gallery. In 1951 his work for the Festival of Britain won an Arts Council award, and in 1956 he was one of Britain’s representatives at the Venice Biennale. In 1979 he had a retrospective exhibition at the Royal Academy, and in 1989 the Serpentine Gallery in London mounted a major exhibition of his work, which subsequently toured to Edinburgh, Preston and York.