Born in Gloucester Terrace on June 1st, 1847, the only child of Benjamin Clark. His parents died when he was young and he was brought up by his grandfather, Andrew Clark, of Greenford Place, near Harrow. He was educated at Brighton College and afterwards at University College School. He entered the medical school attached to the hospital in 1864, was chosen House Surgeon in 1870, and Resident Physician's Assistant or House Physician for the last six months of that year. He was elected Assistant Surgeon to the Middlesex Hospital in 1871 before he had obtained the diploma of FRCS. He served for two years in the out-patient room and acted as Surgical Registrar. In 1875 he was appointed Surgeon to the Ear and Throat Department, being the first to hold the office, and in the same year became Dean of the Medical School, and in this position proved most successful. He resigned in 1887. He lectured on Practical Surgery jointly with Sir Henry Morris (qv) in 1880, and two years later he began to teach the operative surgery classes. He became fourth Surgeon in 1887 and was placed in charge of the Cancer Department of the Hospital, becoming full Surgeon in 1895. He was a good dogmatic teacher of surgery, on the practical rather than on the scientific side. He operated rapidly and obtained good results, though he did not follow Lister's methods. Clark rendered very valuable services to the British Medical Association and served on nearly all its Committees. He represented the Metropolitan Counties Branch on the Central Council from 1892-1899, was Treasurer from 1899-1902, Chairman of Council from 1902-1905, and a General Secretary at the London Meeting in 1895. The British Medical Association recognized his services by awarding him a gold medal in 1905 for distinguished merit. He was also a valued Member of the Council of Epsom College. Clark was an enthusiastic Volunteer. He joined the 1st Volunteer Rifle Corps as a private in 1867 and became Assistant Surgeon to the 4th Middlesex Rifles in 1893. The 4th Middlesex became part of the 13th County of London Battalion of the 2nd London Division of the Territorial Force formed in April, 1908, and Clark, as the senior of all the medical officers, was gazetted PMO of the Division with the rank of Colonel, AMS (TF). In 1906 he was Chairman of a Committee to suggest improvements in the medical arrangements of the Volunteer Force, and many of his suggestions bore good fruit when the Territorial Force was formed two years afterwards. In 1910 he was appointed Honorary Surgeon to the King, being the first Volunteer Medical Officer to be so honoured. As PMO and Administrative Medical Officer of the 2nd London Division (TF) he had the very onerous duty of forming and controlling all the medical details of the division. In the Woolwich companies of the RAMC Volunteers and the 3rd London Bearer Company he found the nuclei of the three field ambulances required, but the two general hospitals and the sanitary company of the division had to be created de novo. It was here that Colonel Clark's administrative capacity, tact, and geniality were of so much use, as the only officers he had available were the Volunteer regimental medical officers, few of whom had any experience of administration; as for non-commissioned officers and men, it is difficult to know how they were obtained, but the units were gradually formed, and under Colonel Andrew Clark's direction they worked well. In addition, medical officers had to be obtained for the infantry battalions, etc, many of which were freshly raised ; it was in this work especially that he found his connection with the British Medical Association so useful. He was an original Member of the Territorial Force Association for the County of London, and worked hard on its sub-committees in the provision of buildings and equipments. He also did much in the formation of Voluntary Aid Detachments in London and Middlesex, and was Chairman of the Voluntary Aid Association from 1890-1908. He retired from the Territorial Force in 1912. Clark was a Knight of Grace of the Order of St John of Jerusalem and a Doctor of Science (honoris causa) of the University of Oxford (1904). Injury to his hand whilst operating in 1906 caused pyaemia which crippled both hands, and compelled him to retire from the Middlesex Hospital in December, 1907. He lived for the rest of his life at Cowley Grove, Uxbridge, Middlesex, where he died on August 29th, 1913. He married in 1876 Mary Helen, eldest daughter of Joseph Hargreaves, of Wellesley House, Prince's Park, Liverpool. She survived him with one son and five daughters. Publications: The Middlesex Hospital Reports of the Medical and Surgical Registrars for 1872. *Ambulance Lectures*, 1888. Editor of 4th edition of Fairlie Clarke's *Manual of Surgery*. A concise history of the Middlesex Hospital Club in the *Middlesex Hosp. Jour.*, 1898, ii, 155. The Club was founded in 1855 by Thomas Taylor and Campbell de Morgan. Clark was Secretary from 1882-1913, and under his guidance the membership was almost trebled and the capital was increased to nearly £1000.