The son of Charles H Chisnall, Esq, of Frating Abbey, near Colchester. He was educated at Framlingham Grammar School with his elder brother, Patrick, and received his professional training at the London Hospital. He won the Jonathan Hutchinson Prize with his essay on "Fractures of the Upper Part of the Humerus and their Treatment", and this was regarded as an earnest of a steady outflow of original work in the future. Personally, he was noted for an imperturbable serenity of mind and a geniality of manner which made him beloved by all who knew him. He was a brilliant talker among friends, a lover of poetry, and a shrewd observer of his fellow-men. He held many resident appointments at the London Hospital. For a year he was Pathological Assistant ; he was also House Physician to Percy Kidd and Sir Henry Head, Receiving Room Officer and House Surgeon to Jonathan Hutchinson, junr, and Hugh Lett. On the outbreak of the War (1914-1918) he volunteered for service in the Royal Army Medical Corps, and was attached to the 1st Cameron Highlanders. On October 24th, 1914, whilst attending to a wounded soldier in the hospital at Poperinghe, he was struck by one of the enemy's shells. He was buried at Elverdinghe, in Belgium, with military honours. Chisnall was one of the first three Fellows to perish in the Great War while on active service abroad with HM Forces (*Calendar*, 1919).