Educated at St George's Hospital, where his career was distinguished. He was Assistant to the Ophthalmic Surgeon and to the Surgical Registrar, Demonstrator of Anatomy and of Operative Surgery, Assistant to the Medical Registrar and the Dental Surgeon, Assistant House Surgeon, Assistant House Physician; then House Surgeon, House Physician, and Surgical Registrar. In 1893 he was Prosector at the Royal College of Surgeons and Clinical Assistant at the Victoria Hospital for Children, Chelsea. At the time of his early death Keyser was Senior Assistant Surgeon at the Cancer Hospital, London, and Consulting Surgeon at the Eliot Memorial Cottage Hospital, Haywards Heath. He died at sea on board the steamship *Athenic* on June 17th, 1910. His practice and residence were latterly at 46 Queen Anne Street, W. Publications: "The Advisability of Preliminary Ligature of the External Carotid Artery and Tracheotomy in Severe Operations about the Face." - *Lancet*, 1902, i, 1530. "Five Cases of Carcinoma of the Male Breast." - *Ibid*, 1904, i, 1493. "Epithelioma of Tongue in Women." - *Ibid*, ii, 829. "Carcinoma of Jejunum." - *Ibid*, 1908, ii, 304. "Case of Achondroplasia." - *Clin Soc Trans*, 1904, xxxvii, 240. "Case of Congenital Elevation of the Shoulder, and Case of Congenital Absence of the Fibula." - *Ibid*, 230. "Congenital Elevation of the Scapula." - *Lancet*, 1904, ii, 1420