Registered Member of:
- General Medical Council (GMC No 3316177)
- Association of Surgeons of Great Britain and Ireland
- Association of Upper Gastrointestinal Surgeons
- Association of Laparoscopic Surgeons
- British Obesity Surgery Society
- International Federation for the Surgery of Obesity
- European Association of Endoscopic Surgery
- South West Gastroenterology Group
- Surgical Club of the South West England
- Qualified in Medicine in 1989 (Bristol)
- Specialised in Upper GI Surgery in November 2001
- Mr Hewin has set up an NHS morbid obesity service in Gloucestershire which has been recognised by the South West Specialist Commissioners as a Centre of Excellence.
- Lead Clinician for Bariatric Surgery at the Gloucestershire Hospitals NHS Foundation Trust since April 2003
- He began working for The Hospital Group at the beginning of 2010.