Born at Dunedin, NZ, on June 16th, 1869, the son of Prideaux Selby, of Kowit, Croydon. He was educated at St Bartholomew's Hospital, and entered the Indian Medical Service as Surgeon Lieutenant on July 28th, 1894, becoming Surgeon Captain on July 28th, 1897; Major on July 28th, 1906, and Lieutenant-Colonel on July 28th, 1914. His war service was long and distinguished. He served in the Chitral Campaign (1895), taking part in the Relief of Chitral, and was awarded the Frontier Medal with a Clasp. He gained two more Clasps in 1897-1898 on the North-West Frontier, in the operations on the Semana Range, August-September, 1897, and in the Relief of Fort Gulistan. In the Tirah Campaign (1897-1898) he was present at the actions of Chagru Kotal, Dargai, of the Sampagha and Arhanga Passes; in the Waran Valley operations, especially the action of November 16th, 1897; in the operations at and around Dwatoi, and the action of November 24th, 1897; in the operations against the Khanni Khel Chamkannis; and in those in the Bara Valley (December 7th-14th, 1897). For these services he received a fourth Clasp, and was mentioned in dispatches and decorated with the DSO. On April 15th, 1910, he was appointed Hon Surgeon to the Viceroy of India, and was the senior, in date of appointment, of the holders of that post. On the opening of the new King George's Medical College at Lucknow, he was appointed Principal of the College and Professor of Surgery. He died at Lucknow from the effects of a cycle accident whilst on active service on September 8th, 1916.