At the College of Surgeons Thomas was a member of the court of assistants from 1818 to 1845, examiner from 1818 to 1845, vice-president in 1827, 1828, 1836, and 1837, and president in 1829 and 1838. In 1827 he delivered the Hunterian oration, with personal reminiscences of Hunter. He was elected a Fellow of the Royal Society on 16 January 1806, and was also a member of the Imperial Academy of St. Petersburg. He died at Belmont, Torquay, on 26 June 1846.
