Born in 1864 he was educated at St Bartholomew's Hospital, where he served as house surgeon. He was resident medical officer at Farringdon General Dispensary, and medical superintendent of the Mildmay Mission Hospital at Bethnal Green. He went to Colombo, Ceylon as a medical missionary about 1901, but returned to Barnet, Herts after the first world war. He was for a time medical superintendent of the Bristol Medical Missionary Society, living at Clifton; then practised for some twelve years at Foulsham, Norfolk; and finally retired to Barnet about 1938. He died there on 22 February 1957 aged 92, survived by his wife Mary McLeod and three daughters. Mrs Thomas died at Cheddar on 17 July 1962 aged 95, and was buried at Barnet.