Scottish painter, who after studying Law at Edinburgh University (1944-6) and London's Middle Temple (1948) attended the Slade School of Fine Art in London (1952-4). His work is characterised by the use of intense, pure colour to describe shape and form in extremely spare compositions. His subject matter is traditional, featuring religious themes, landscapes, portraits and still-lifes. In 1955 Aitchison was awarded the British Council Italian Government Scholarship for painting and travelled to Italy, where the clear light and natural 'Biblical' landscapes had a profound influence on his work. Aitchison's religious scenes are not of an ecclesiastical discipline, but have a timeless, poetic and mysterious atmosphere reminiscent of 15th-century miniatures. In his portraits, colour and composition are key. In 1978 Aitchison was elected an Associate Member and in 1988 a Member of the Royal Academy of Arts, London.