The elder son of Alfred Henry Collier, LSA (1884), who afterwards. practised at Cranford, near Hounslow, Middlesex, and of Sarah Stansfield, his wife. He was born on 15 July 1864 at Shore Hill, Littleborough, Lancashire. He was educated by a private tutor until he entered St Mary's Hospital as a medical student. Here he gained scholarships in medicine, surgery, and pathology, and served as house physician, house surgeon, ophthalmic house surgeon, resident medical officer, and assistant anaesthetist. He then acted for a few months as surgeon in the Glen shipping line, and on his return to England acted as resident clinical assistant to the Leicester Infirmary and fever house, being subsequently appointed clinical assistant at the London Fever Hospital. He was demonstrator of anatomy in the medical school of St Mary's Hospital from 1894 to 1898, and in 1897 was elected assistant surgeon to the hospital. From 1897 to 1902 he was surgical tutor and from 1906 to 1911 he lectured on surgery, jointly with James Ernest Lane, FRCS. In 1898 he was appointed surgeon to the Hospital for Sick Children in Great Ormond Street, where some years earlier he had been the senior resident medical officer. He was also surgeon to Lord Mayor Treloar's Home and College for Crippled Children at Alton, Hants. His health began to fail in 1911 but he continued to act as teacher of surgery at the Royal Army Medical College in Grosvenor Road, and during the European war he served with the rank of captain, RAMC (T) as a member of the staff of No 2 General Hospital. He died, after long, retirement, at Teynham, Kent on 26 February 1930, having married Margaret, daughter of Robert Young of Clontarf, Co Dublin, who survived him but without children. James Stansfield Collier, FRCP his younger brother, was physician to St George's Hospital and died 9 February 1935. Collier was a good teacher and an excellent surgeon. He devoted himself at first more especially to the surgical diseases of children but soon acquired a large practice in general surgery. He overtaxed his strength and was thus led into drug-taking habits. Outside his profession he was interested in horses and horse-breeding, riding and hunting. Publications:- *An index of treatment by various authors*, edited by Robert Hutchison and H S Collier. Bristol, 1907; 2nd, 3rd and 4th editions 1908; 5th edition 1910; 6th edition 1911. Introductory address to students. *St Mary's Hospital Gazette*, 1900, 6, 108. Surgery of the Appendix, *ibid* 1900, 6, 124.