Born 13 September 1854 at Hull, Yorkshire, the sixth child and third son of William Joseph Lunn, FRCS by election, and Mary Heath Craven his wife. His grandfather, William Lunn, was also elected a Fellow. There we thus three generations elected into the Fellowship, a unique distinction. He was educated at Cheltenham College and at St Thomas's Hospital, where he served as house surgeon. He also served as resident accoucheur, junior house surgeon, and senior assistant house physician at the London Chest Hospital, Victoria Park, E, and was resident assistant medical officer at the East London Hospital for Children, now a part of the Queen Elizabeth Hospital. He then became resident medical superintendent of the St Marylebone Infirmary. He was created OBE for his work in the war of 1914-18. Lunn was a member of the Ophthalmological Society, the Medical Superintendents' Society, and the British Medical Association. He married on 25 August 1881 Ida Maund de Pointing Northcott; there were three sons, who all died at birth. Lunn died at the Cottage, Chaucer Road, Worthing, to which he had retired some years previously, on 19 August 1942, aged 87.