Born on 6 June 1890 at Cardiff, the son of Charles William Marshall and Mary Jennings, he was educated at Cardiff High School and studied medicine at Charing Cross Hospital where he gained a University Scholarship in 1909. He graduated in 1912 with honours in medicine, pathology and forensic medicine, being awarded a gold medal. He proceeded to the degree of MD in 1914 and was awarded a Murchison Scholarship by the Royal College of Physicians. He held many residential appointments at Charing Cross Hospital, and in 1915 became a Fellow of the College. He then served as assistant surgeon to the Anglo-Russian Hospital at Petrograd under Sir Herbert Waterhouse, afterwards serving in the RAMC at Salonika. In 1916 he had obtained the MS, winning a gold medal. After the war he was for a short time assistant surgeon and assistant orthopaedic surgeon at King's College Hospital, but was then appointed to the staff of Charing Cross Hospital, where he became in due course full surgeon and a governor. From 1919 to 1932 he was surgeon to Manor House Hospital and consultant to the Ministry of Pensions. Later he was consulting surgeon to the Bromley District Hospital, to St Charles Hospital and to Kingston Hospital, Surrey, and during the 1939-45 war was director of the Sutton EMS Hospital. Jennings Marshall acted as an examiner in surgery for the Universities of Manchester and London, and was the author of numerous works. A good teacher, he was an excellent diagnostician and skilful operator. Fond of music and the arts, he was a member of the Savage Club, and in his spare time an amateur radio mechanic. In his youth he had been a hockey player as a trial cap for Wales. In 1945 he married Hope Embleton Smith. He died suddenly on 29 December 1954, survived by his wife. Publications: Notes from the Anglo-Russian hospitals, with Sir Herbert Waterhouse and W D Harmer. *Brit med J* 1917, 2, 441. *A textbook of Surgical Pathology*, with Alfred Piney 1925. *The Surgeon*, London, G Bles 1932. *Surgical anatomy and physiology*, with Norman C Lake. London, H K Lewis 1934. *Chronic Diseases of the Abdomen*. London, Chapman and Hall 1938.