Born on 28 March 1888 at Corbar NSW son of a schoolmaster, he was educated at Sydney Grammar School and Sydney University. Qualifying in 1911 he was appointed RMO at Royal Prince Alfred Hospital in Sydney and in 1912 he became a demonstrator of anatomy. In 1914 he joined the Australian Expeditionary Force in New Guinea as a Captain in the RAAMC and was second in command under Neville Howse from August until October, in which month he took command until April 1915 when he joined the staff of the DGMS. From 1916 to 1918 he commanded the 9th Field Ambulance AIF and was mentioned in dispatches four times. From 1918 to 1920 he was ADMS 3rd Division in France, and on his return to Australia DDMS 2nd Military District from 1921 to 1934. In 1935 he was appointed honorary surgeon to the Governor- General, and in 1941 was promoted Major-General as DGMS from which he retired in 1942. From 1944 to 1945 he acted as consulting surgeon to the Women's Branch of the Royal Australian Navy. From 1920 to 1925 he was acting Professor of Anatomy at Sydney University, working as an examiner from 1920 to 1938, and while on a visit to Brisbane in 1932 gave a demonstration in the new anatomy school in William Street on the anatomy of the female pelvis in relation to repair operations. From 1934 to 1939 he was a member of the Senate of Sydney University and chairman of the Cancer Research Committee from 1936 to 1938. Maguire became senior gynaecological surgeon to the Royal Alfred Hospital as consulting gynaecologist to St Vincent's Hospital, Sydney. In 1934 he had been President of the section of naval and military surgery at the Australian Medical Congress in Hobart, President of the section of gynaecology of the BMA at Brisbane in 1950, and President of the NSW branch in 1950-51. He was a member of Sydney Municipal Council in 1949 and 1950. As a teacher he was outstanding, writing in particular on anatomy with reference to gynaecological problems. A kind, generous and enthusiastic man, he had great courage and a tremendous capacity for work. Hospitaller and Almoner of the Australian Priory of the Order of St John of which he was a Commander, he was also a prominent Freemason representing the United Grand Lodge in NSW and was Grand Master of Grand Lodge of NSW in 1930-31 and in 1944. Maguire was married three times and survived by his third wife, Dr M M McElphone, a research colleague. He died on 10 June 1953 aged 65.