Alexander was educated at Maze Hill School, St. Leonard's; at Tonbridge School - entering in 1898 and where he became head of his house; at Christ's College, Cambridge - entering in 1903 and where he entered heartily into the life and spirit of the University, and was a member of the Mounted Infantry Corps; and Guy’s Hospital - entering in 1908 and where he had an unusually successful career, not merely from academic brilliance, but because he was recognised as a man of exceptional character, who gained the confidence of every one with whom he came in contact. He was President of the Guy's Residents, and held House Appointments for two years, including House-Surgeon and Resident Obstetric Physician. Alexander was known to have been a keen sportsman. His father teaching him to use gun when he was only ten years old. He also played golf, and on one occasion won a cup at the Gray's Golf Club. He was a powerful swimmer, and enjoyed horse riding. On 8th March 1915, he gave up the post of Resideint Obstetric and joined the Royal Army Medical Corps at the rank of temporary Lieutenant. After a short period of training at Aldershot he proceeded to France, entering on 22nd April 1915 and was attached to the Rawal Pindi Hospital in Boulogne. On 21st December 1915 he was transferred to Mesopotamia. He was promoted to temporary Captain on 8th March 1916. He died as the result of overwork and unsanitary conditions. Alexander was the second son of Mr and Mrs Jonathan Seabrooke of The Elms, Grays, Essex.