Born at Warkworth, Northumberland on 24 August 1854, the third son of the Rev J Woodham Dunn, Vicar of Warkworth, and Sarah Emily, second daughter of the Rev Luke Yarker of Leyburn Hall, Yorkshire. He received his education at Richmond Grammar School in Yorkshire, at the Clapham Grammar School, at St Bartholomew's Hospital, and in Paris. He filled the office of house surgeon at the Belgrave Hospital for Children, was clinical assistant at the Royal South London Ophthalmic Hospital and was house surgeon at the Seamen's Hospital, Greenwich. He became pathologist to the West London Hospital at Hammersmith, and in 1885 was appointed assistant ophthalmic surgeon to this hospital, where he became surgeon in the eye department on the resignation of Bowater J Vernon in 1898, and consulting surgeon on his own resignation in 1914. Dunn was throughout his professional life a stalwart worker in the cause of postgraduate medical education, and was instrumental with Leonard A Bidwell, FRCS in establishing on a satisfactory basis the West London Postgraduate College which had been foreshadowed by Robert Bell Keetley, FRCS. Dunn also did much to enhance the reputation of the West London Medico-Chirurgical Society of which he became secretary in the fourth session (1885-86) and was vice-president in 1889-90, having acted as editor of the Transactions in 1884-88. In later years he was an Honorary Fellow of the Fellowship of Medicine. Dunn was equally well known as a medical journalist, and was for many years the assistant editor of the *Medical Press and Circular* and conducted the *West London Medical Journal* (1896-1904). He edited the Fellowship of Medicine's *Bulletin* and was editor of the *Franco-British Medical Review* (1924-31). He also contributed articles to the lay press on such subjects as "The loss of orientation in insured workmen", "What London people die of" (*Nineteenth Century* 1893), "Modern surgery" (*Ibid*. 1894), "Is our race degenerating" (*Ibid*. 1894). His writings were always clear, well expressed, and interesting. He married Marian, only daughter of J C H Flood, who survived him with two sons and two daughters. He died 2 March 1931. Publications: An enquiry into the causes of the increase of cancer. *Brit med J*. 1883, 1, 708 and 761. *The theory of cancerous inheritance*. London, 1886. *Infant health: the physiology and hygiene of early life*. London, 1888. New method in the discission of soft cataracts. *Lancet*, 1900, 2, 871. Reminiscences of the library of the Royal College of Surgeons. *Med Press*, 1919, 158, 71.