Bariatric & Metabolic Surgery

Meet the Team

Meet the Team

Dr Hewin

Consultant Bariatric Surgeon

Mr. Hewin is a General surgeon working mainly with Upper Gastrointestinal surgery cases. His specialist interests include bariatric surgery (weight loss surgery, including gastric band and gastric balloon), advanced laparoscopic (keyhole) surgery and cancer surgery.

Career Synopsis:

  • Qualified in Medicine in 1989 (Bristol)
  • Specialised in Upper GI Surgery in November 2001
  • Mr Hewin has set up an NHS morbid obesity surgery 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

Darwin Mayo

Msc Bsc Nursing, Senior Theatre Nurse

Darwin is our senior nurse involved in the gastric band adjustments. He is also our anaesthetic nurse, who specialises in anaesthesia and assists the anaesthetist in the bariatric operating theatre. He has vast experience in this field, including vascular recovery and is a support provider for advanced cardiac life support, patient controlled analgesia, immediate life support. He is also a key trainer in anaesthetic monitor suction ECG machines (Hammersmith Hospital UK).

From 2003 to 2013 Darwin worked as an anaesthetic and recovery nurse in the Mater Hospital, recovering vascular, orthopaedic/spinal, cardio-thoracic, urology, plastic and ophthalmic cases. He also has experience in assisting in anaesthesia for heart and lung transplants, and is highly trained in difficult airway management.

Mr David Keogh

B.Sc. Bariatric Unit Coordinator

David Keogh, our weight loss surgery co-ordinator, originally delved into the field of engineering. However, having discovered that this path wasn’t for him, he enrolled himself into a Bachelor of Science degree. Several years later David graduated with a degree in Sports Science and Health. Since then, David has attended the Royal College of Surgeons in London and completed courses in Bariatric Patient Management. He has also, completed courses under the International Olympic Council in Nutrition and Dietetics for Health and Fitness.

Whilst doing his degree David also gained several coaching qualifications including Olympic weight lifting, rugby, tenpin bowling and football.

Unhappy with his weight, David began following a diet and exercise program which he developed himself. Within one year David lost almost five stone in weight. During this time he developed an enormous interest in the topic of weight loss and weight management and decided to enter into the field of weight loss surgery in order to help others achieve what he had achieved himself.

In his spare time, David plays tenpin bowling and has represented Ireland on a number of occasions. He is also a keen marathon runner and takes great pride in helping others to achieve their desired goals.

Dr Rodrigo Oliveira


Professor and Physician Bariatric, Metabolic and Digestive Surgeon

Dr Oliveira has been successfully practicing medicine for more than 26 years.

Originally from Rio De Janeiro, Brazil, Dr Oliveira has operated in the US, South America, Portugal and Ireland. Prior to working at Auralia Hospital, Dr Oliveira was the Head of the Bariatric and Metabolic Surgery Department, Cruz Vermelha Hospital in Lisbon, carrying out thousands of bariatric surgeries.

Registered with the Irish Medical Council (IMC number 429828) Dr Oliveira has lectured and held masterclasses for other surgeons around the world in the art of Bariatric Surgery. *Detailed list available upon request.

Dr Oliveira takes great pride in his work and likes to get to know his patients personally.

Memberships & Current Positions

  • Consultant Bariatric Surgeon – Auralia Hospital, Dublin, Ireland
  • BOMSS – British Obesity & Metabolic Surgery Society, London
  • American Society for Metabolic & Bariatric Surgery – ASMBS, Boston
  • Irish Medical Council (IMC number 429828)
  • General Medical Council Registered
  • Listed on the specialist Registry as a Bariatric and Metabolic Surgeon
  • Society International Federation for the Surgery of Obesity and Metabolic Disorders
  • Brazilian Society of Bariatric and Metabolic Surgery SBCBM, Rio de Janeiro
  • Portuguese Society of Obesity and Metabolic Surgery – SPCO, Lisbon
  • Portuguese Society for Study of Obesity, Lisbon
  • Portuguese Society of Minimally Surgery SPMIN, Lisbon