After receiving his M.L. Hewett was appointed
Downing Professor of Medicine, one of the most senior medical appointments in the gift of the
University of Cambridge. Hewett was also appointed a
Fellow and Tutor at
Downing College, Cambridge in 1814 and later he received his
Doctorate of Medicine in 1822. On receiving his M.D. on 9 August 1822 he was also appointed as a Member of the
Royal College of Physicians, becoming a fellow on 12 April 1824. On 25 March 1825 he was appointed the physician to
St George's Hospital, London a position in which he served until 1833. He was also appointed
Physician-Extraordinary to the King,
William IV on 20 July 1832, although no works were published under his name during that appointment. His distinguished career although outdone by his younger half-brother
Prescott Gardner Hewett did inspire him to also join
St George's Hospital in his wake. ==Personal life==