Born 19 August 1876, elder son of John William Collinson, wool merchant of Halifax, and Frances Whiteley, his wife. He was educated at the Quaker schools at Ackworth and Bootham, and at the Yorkshire College Medical School at Leeds. He received his clinical training at the Leeds General Infirmary, where he served as house surgeon to Edward Ward, FRCS, surgical registrar, resident casualty officer, and resident surgical officer. He was elected assistant surgeon in 1907, became surgeon on his return from war service in 1918, and was appointed consulting surgeon on retirement in 1941. Collinson was also consulting surgeon to St James's Hospital, Leeds, to Clayton Hospital, Wakefield, the Mirfield Memorial Hospital, the Skipton and District Hospital, and the West Riding Mental Hospital at Wakefield. He was commissioned in the RAMC on the formation of the territorial force in 1908. At the outbreak of war on 4 August 1914 Collinson was mobilized with the 2nd West Riding field ambulance, with which he went to France in April 1915. He was later ADMS of the 62nd (West Riding) division, with the rank of colonel, AMS. He was mentioned in despatches, won the DSO and the Médaille de la reconnaissance française, and was created CMG, CB, and a chevalier of the French Legion of Honour; he was also awarded the territorial decoration. On coming home to Leeds, Collinson took an active part in the work of the medical school and of professional societies. He was successively clinical lecturer, professor of clinical surgery 1927-33, and professor of surgery 1933-36, and thereafter emeritus professor, in the University of Leeds. He served as dean of the medical faculty 1936-41, and University of Leeds representative to the General Medical Council 1936-42. He was chairman of the Leeds division of the British Medical Association in 1935-36 and served on the committee of the association's group of English and Welsh consultants and specialists. He was president of the Leeds and West Riding Medico-chirurgical Society. During the second war Collinson was a group officer of the emergency medical service and second regional adviser in surgery. Collinson married in 1907 Alice Maud, daughter of J B Pickford of London, who survived him with a son, Dr John Collinson, MRCS, and two daughters. He died at his home Orchard House, Linton, Wetherby on 25 January 1945, aged 68, after three months' illness. A memorial service was held at St George's Church, Great George Street, Leeds. He had practised at 27 Park Square, Leeds and previously lived at The Barn, Linton. Collinson's abilities were matched by his straightforward and unselfseeking character. He was a man of great courage, kindness, and generosity. As a young man he played hockey and later golf, and was a keen huntsman and fisherman. Publications:- Complete division of duodenum treated by closure and gastroenterostomy. *Brit J Surg* 1914, 1, 665. Present day problems in surgery of gastric and duodenal ulcer. *J Amer med Ass* 1914, 63, 1184. Case of nephrectomy for polycystic disease of kidney. *Brit J Urol* 1933, 5, 156.