Painter, cousin of the Australian painter Sir John Longstaff, Will developed an interest in art while serving in the Boer War in South Africa. During World War I he was an Official War Artist, was commissioned and worked with the Australian Army on camouflage. The war left a mark on his art, one of the results of which was his much-reproduced picture The Ghosts of Menin Gate, presented to the Australian Federal Government by Lord Woolavington. After the war Longstaff settled in north London, where he died, and showed at the RA Summer Exhibition. As well as mystical and allegorical pictures he produced conventional works such as decorative and delicate oil on canvas Still Life with Flowers, offered by Sotheby’s Olympia in 2004. He is represented in the Australian War Memorial, Canberra.