Born 1 June 1886, the only son of James Cossar Ewart (1851-1933), MD, FRS, for forty-five years (1882-1927) Regius Professor of Natural History at Edinburgh University, and his second wife Edith Sophia, daughter of George Turner, MRCS, of Sherborne, and sister of Sir George R Turner and Edward B Turner, both Fellows of the College (For a memoir of J C Ewart, see Royal Society of London, *Obituary notices of Fellows* 1932-35, 1, 189, with portrait.) G A Ewart was educated at Edinburgh Academy, at Clifton College 1900-04, and at Edinburgh University, where he was Vans Dunlop scholar 1905; he became a scholar of Christ's College, Cambridge, in 1906. He took first-class honours in the Natural Sciences Tripos, Part I, in 1908, and represented the University against Oxford as a cross-country runner the same year. At St George's Hospital Medical School, where he entered on 24 November 1909, he won the Brackenbury surgery prize in 1911, the William Brown scholarship in 1912, and the Herbert Allingham surgical scholarship in 1913. He served as house physician to Sir Humphry Rolleston, and house surgeon to Sir Crisp English, and as surgical registrar. He was appointed assistant surgeon in 1914, becoming, in due course, surgeon and lecturer in operative and practical surgery. He was also surgeon to the Atkinson Morley Convalescent Hospital and to the Rupture Society, and consulting surgeon to the Hospital of St John and St Elizabeth. He was a Fellow of the Association of Surgeons. During the war of 1914-18 he was commissioned captain, RAMC(T), on 4 January 1915, and later promoted major. He served at the 54th General Hospital with the BEF in France, and at the 4th London General Hospital at the Duke of York's Headquarters. Ewart married in 1914 his first cousin Dorothy, younger daughter of Sir George Turner, FRCS, surgeon to St George's Hospital. Mrs Ewart survived him with a son and two daughters. He practised at 44 Brook Street and later at 26 Queen Anne Street, and lived in Norfolk Crescent and later at the Old House, Weybridge, where he died, after one day's illness, on 2 October 1942, aged 56. Ewart's dramatic methods in surgery were based on a sound and sure technique. He excelled at emergency operations for acute abdominal diseases. He was a good teacher and a hospitable host. Shooting, photography, and natural history made up his non-professional occupations. Publications:- Acute retention of urine complicated by perforation of a duodenal ulcer. *Brit med J*. 1921, 1, 420. A case of hour-glass stomach. *Brit J Surg*. 1921, 9, 42. Gastric diverticula, with report of a case before and after operation. *Brit J Surg*. 1936, 23, 530.