Born in London on 23 November 1893, the eldest son of Cesare Corsi, an Italian provision merchant, and Alice Bertarelli, his wife. He was educated at Uppingham and Pembroke College, Cambridge, where he took second-class honours in the natural sciences tripos part 1, 1916. He took his clinical training at St Bartholomew's Hospital, where he was house surgeon to Girling Ball. After serving as resident surgical officer at the Miller Hospital, Greenwich, he came under the influence of Dr H G Adamson in the skin department at St Bartholomew's and specialized as a dermatologist. He was chief assistant to Adamson and to Dr A C Roxburgh for sixteen years 1926-42, and then became assistant physician, retiring in 1945. He was also surgeon to the Lock Hospital, but gave most of his interest to his work as physician to St John's Hospital for Diseases of the Skin, where also he was librarian from 1946 and chairman of the medical committee from 1948, and president of the St John's Dermatological Society from September 1948. He was interested in the application of new remedies and therapeutic methods, but not himself a research worker; and was a sound, helpful teacher and a sympathetic clinician He was secretary of the dermatology section at the British Medical Association annual meeting in 1934. Corsi was a man of wide cultivation, not only bilingual in English and Italian, but a good French and German scholar, a book collector, and a student of Dante. He was a prominent bridge player in "Our Whist Club" and a regular ski-er in Italy or Switzerland. He was a delightful and drily humorous after-dinner speaker. He was dogged by ill-health in his last years, following a car accident, and died suddenly in Switzerland on 1 January 1950, aged 56. Corsi married in 1924 Margaret Doyle, who survived him with a son and daughter. His house, 114 Harley Street, was destroyed by enemy action in the war of 1939-45 and he lost most of his possessions; he subsequently lived at 95 Harley Street. Publications:- Epithelioma of the skin: a review of treatment. *St Bart's Hosp J* 1938, 46, 28. Therapeutic uses of thorium x. *Lancet*, 1943, 2, 346.