After the war, Ian devoted the rest of his life to Merchiston Castle School, where he taught biology, became a housemaster, continued teaching until 1971 and remained closely involved in school life for very many years afterwards. He had a profound influence on generations of pupils. He loved travelling, had a very cosmopolitan outlook, never married but loved the company of women and was much loved by nieces, nephews and god-children. Ian had a deep Christian faith which found expression in his infectious zest for life.