Born on 23 October 1872, the son of the Rev John Ferguson MacCallan MA, Vicar of New Basford, Notts, and Elizabeth his wife, daughter of Thomas Danks, chairman of the Nottingham and Nottinghamshire Bank, MacCallan was educated at Nottingham High School, Charterhouse School, Christ's College, Cambrid

Born in London on 19 July 1876 a son of William McMullen of Camberwell, he was educated at the City of London School, King's College, London and King's College Hospital. After qualification he served as house surgeon, curator and pathologist at the Royal Westminster Ophthalmic Hospital. His first co