Meet Our World-Leading Weight Loss Surgeons

Our bariatric (weight loss) surgeons are the best in the business. 

We’re here to put your mind at ease, ensuring that your weight loss journey with Tonic is safe and comfortable.

Learn about our weight loss surgeons

What Makes a Tonic Surgeon?

All Tonic surgeons are highly experienced practitioners, all of whom are registered with the GMC (General Medical Council) and are fully trained in bariatric surgery. 

All of our surgeons also have a post within the NHS, undertaking upper gastrointestinal surgery. We only work with trusted, experienced and specialist surgeons.

Registered with the GMC
Employed by the NHS
Fully trusted with our patients
Years of medical experience
Fully trained in bariatric surgery

Meet Our Leading Bariatric Specialist Surgeons

All 12 (12)
Gastric Band
Gastric Bypass
Gastric Sleeve
Allurion Pill Balloon
Mini Gastric Bypass
Gastric Revisional Surgery

Jomana Karim

Bariatric Practitioner

Dr Andrea Pucci

Specialist Bariatric Physician

John Robinson

Consultant Specialist Bariatric Surgeon

Marco Adamo

Specialist Bariatric Surgeon

David Hewin

Consultant Specialist Bariatric Surgeon

Mr Waleed Al-Khyatt

Consultant Laparoscopic, Bariatric & Upper GI Surgeon

Bilal Alkhaffaf

Consultant Specialist Bariatric Surgeon

Peter Coe

Consultant Bariatric Surgeon

Mr Omer-Al-Taan

Bariatric Surgeon

Sherif Awad

Consultant Specialist Bariatric Surgeon

Simon Dexter

Consultant Specialist Bariatric Surgeon

Mr Shamsi El-Hasani

Consultant Bariatric Surgeon
Bariatric Practitioner

Jomana Karim

Dr Jomana Karim is a General Practitioner with a special interest in obesity management.  She has extensive experience of working in weight management services and has helped several hundred patients through their bariatric surgery journeys with her expert clinical and practical advice.

Dr Karim completed her undergraduate medical education at the University of St Andrews (2007) & the University of Manchester (2010). She received her Certificate of Completion of Training (CCT) in General Practice in 2016. Once a qualified GP, she worked for ‘A Better Life’ Health, a Tier 2 & 3 local authority and Public Health England-funded weight management service.

Dr Karim holds SCOPE certification from the World Obesity Federation and has been trained to provide cognitive behavioural therapy (CBT) for the management of obesity.  She is a recognised Novo Nordisk speaker for the injectable weight loss medications.

She has a passion for health and fitness and is a qualified swimming instructor and personal trainer.  Outside of work, she enjoys spending time with her children.

Specialist Bariatric Physician

Dr Andrea Pucci

Dr Andrea Pucci PhD is a Consultant Obesity Physician. He is based at Bariatric Centre for Weight Management and Bariatric Surgery of the prestigious University College London Hospital. 

 Dr Pucci graduated in 2003 at the University of Pisa, Italy. He subsequently obtained his specialist qualification in Endocrinology in 2008 at the Department of Endocrinology, University of Pisa. In 2011, Dr Pucci moved to London and joined the Centre for Obesity Research at University College London obtaining his PhD in 2011.  

 Since 2011, Andrea has worked both in the clinical and research setting at University College/ University College London Hospital assessing and managing patients with severe obesity in particular patients before and after bariatric surgery. His research is focused on identifying pre-operative predictors of bariatric surgery health outcomes and he has authored more than 30 peer-reviewed publications in international journals and textbook chapters.

Consultant Specialist Bariatric Surgeon

John Robinson

Qualifications 

Doctor of Medicine (MD)

MB ChB (Bachelor of Medicine, Bachelor of Surgery)

MMedSci (Masters of Medical Science)

Certificate of Completion of Training (CCT)

FRCS (Fellow of The Royal College of Surgeons of England)

Joint Advisory Group (JAG) Endoscopy Trainer

Registered: General Medical Council (GMC) No. 4216003 

Professional Memberships 

British Obesity & Metabolic Surgery Society

Association of Surgeons of Great Britain and Ireland

Association of Upper Gastrointestinal Surgery of Great Britain and Ireland

British Medical Association

Association of Military and Trauma Surgeons 

About Steven John Robinson 

John Robinson is a highly experienced consultant general surgeon with a specialist interest in upper gastrointestinal and bariatric (weight loss) surgery.

He has gained extensive expertise throughout his career. During his medical training, and following his Certificate of Completion in General Surgery, he practised in the NHS, the military and in New Zealand, in roles which enabled him to acquire the skills that he continues to use to benefit his patients. 

A Substantive Upper GI and General Surgery Consultant at Worcestershire Acute Hospitals NHS Trust since 2014, John is committed to continued professional development. In order to ensure that his skillset and knowledge continue to be current, he attends educational courses and has taken part in various conferences and meetings which have helped to further increase his specialist competence. He has also written and contributed to publications relating to his area of expertise and has presented to his peers at conferences in the UK and abroad. 

He is currently a member of the faculty of surgical trainers with The Royal College of Surgeons of England as well as a trainer with Advanced Trauma Life Support® – care of critically ill patients – and an endoscopy trainer. Undergraduate teaching commitments include Senior Academy Tutor and a validated examiner for the University of Birmingham Medical School, where he teaches and lectures medical students. In addition, he is a reviewer for the British Medical Journal.

Specialist Bariatric Surgeon

Marco Adamo

Mr Marco Adamo MD is a consultant surgeon and lead surgeon of the Bariatric Unit at the prestigious University College London Hospital. He is specialises in upper gastrointestinal, bariatric and minimally invasive surgery.

Mr Marco Adamo graduated in Italy, where he also completed his training in general surgery. He practiced six years in Yorkshire, where he was appointed consultant in 2006. He was also awarded MD by Leeds University for his research on appetite hormones and bariatric surgery.

In 2007 he has been recruited by the University College London Hospital (UCLH) to setup a new service for obesity surgery. He now leads a very successful high volume bariatric surgery unit which is one of the most renowned and respected in UK and Europe. He performs more than 200 bariatric cases/year with many cases of extreme obesity and complex reversional surgery. All procedures are carried out with laparoscopic (keyhole) technique. His complication rates are amongst the lowest published worldwide.

Passion for innovation – Single incision bariatric surgery.

Mr Adamo is a pioneer of this new revolutionary technique which employees only a small cut and leaves virtually no scars. He has successfully performed first in UK and amongst the first in the world performing many bariatric procedures such as the Sleeve Gastrectomy.

“Innovation and technology are opening new frontiers in modern healthcare. Pain and scars have been drastically reduced and surgery is much safer. Patients can now go home sooner after surgery and return to all activities within days.”

Consultant Specialist Bariatric Surgeon

David Hewin

David Hewin is a specialist laparoscopic (keyhole) upper gastrointestinal and bariatric (weight loss) surgeon. He qualified from the University of Bristol and works as a consultant surgeon at Gloucestershire Royal Hospital and Cheltenham General Hospital, where he established the Bariatric Surgery Unit in 2004. David continues to teach other doctors, GPs and medical students about weight loss surgery and regularly gives specialist lectures and talks to nurses, dietitians and members of the public.

After qualifying, he completed surgical training including The Royal College of Surgeons of England Fellowship in New York.

David has written and published many articles and book chapters about weight loss surgery and other aspects of upper gastrointestinal surgery. He has also delivered numerous national and international lectures and was appointed the first Specialist Tutor in Bariatric Surgery at The Royal College of Surgeons of London, developing training resources and courses for other surgeons, specialist nurses, dietitians and operating theatre teams.

David has a UK-wide reputation as a bariatric and laparoscopic surgeon, having served on the councils of several national surgical societies including the Association of Upper Gastrointestinal Surgery (as Honorary Secretary), the British Obesity & Metabolic Surgery Society and the Association of Laparoscopic Surgeons. He also served as a Trustee of the British Obesity Surgery Patient Association (BOSPA).

Memberships

British Obesity & Metabolic Surgery Society

International Federation for the Surgery of Obesity (IFSO)

Association of Upper Gastrointestinal Surgery

Association of Laparoscopic Surgeons

Association of Surgeons of Great Britain and Ireland

European Association for Endoscopic Surgery

British Medical Association

The Royal College of Surgeons of England

Consultant Laparoscopic, Bariatric & Upper GI Surgeon

Mr Waleed Al-Khyatt

Mr Waleed Al-Khyatt is a consultant upper GI, bariatric (obesity) and laparoscopic (keyhole) surgeon at University Hospitals of Derby and Burton NHS Foundation Trust. He also holds the position of Honorary (Consultant) Assistant Professor of Surgery at the University of Nottingham School of Medicine.

Mr Al-Khyatt qualified from the University of Mosul College of Medicine with honours. Following completing his basic surgical training in South Wales, he undertook his higher surgical training in the Health Education England East Midlands – North and was awarded his fellowship (FRCS) and Certificate of Completion of Training (CCT) from The Royal College of Surgeons of England.

He completed The Royal College of Surgeons of England Fellowship Programme in advanced laparoscopic and bariatric surgery at St Richard’s International Bariatric and Metabolic Surgery Centre of Excellence in Chichester, United Kingdom. In addition to emergency surgery, he has been fully trained in surgical management of patients with morbid obesity, which is his main compassion and subspecialty, oesophagogastric cancer, refractory GORD (acid reflex), open and laparoscopic repair of abdominal wall hernias, and gallstone disease.

Mr Al-Khyatt was awarded a PhD from the University of Nottingham for his research into the role of oestrogen receptors in oesophageal cancer development. His research projects have been presented at national and international prize sessions and awarded first prize medal from the Midland Gastroenterology Society. He has several published book chapters and peer-reviewed papers. His research interests include the pathogenesis of oesophageal cancer, improving outcomes in bariatric and metabolic surgery, using quality markers to improve outcomes in emergency surgery, and participation in national collaborative audit/research studies.

He takes great pride in providing compassionate care to all his patients by treating them as individuals with self-kindness and mindfulness. His approach is based on empowering his patients to be fully informed, to feel at ease and to be at the centre of any decision-making.

Waleed is married and has two daughters. His hobbies are basketball and swimming and he is a keen follower of the English Premier League.

Consultant Specialist Bariatric Surgeon

Bilal Alkhaffaf

Bilal Alkhaffaf is a consultant upper gastrointestinal and bariatric surgeon at Salford Royal NHS Foundation Trust – the country’s largest upper gastrointestinal surgical centre. He has a specialist interest in advanced minimally invasive (keyhole) surgery. Mr Alkhaffaf has further developed his expertise by visiting international surgical centres of excellence in the United States, South Korea and The Netherlands as well as a number of leading organisations within the United Kingdom.

Bilal grew up in Manchester and attended the University of Manchester, from which he graduated in 2003. He prioritises the delivery of excellent medical care for all his patients and believes that this should be achieved through a relationship based on trust, clear communication and an empathetic approach. He specialises in the treatment of conditions affecting the upper gastrointestinal tract. In addition to all aspects of weight loss surgery, he treats oesophageal and gastric cancer, benign oesophageal and gastric disorders, acid reflux, hiatus hernias, achalasia, gallstones and hernias.

Research

Mr Alkhaffaf is active in the field of research and holds the position of Honorary Senior Lecturer at the University of Manchester. His research activities have resulted in his award of a prestigious National Institute of Health Research Doctoral Research Fellowship. Mr Alkhaffaf has a particular interest in the way surgical outcomes are reported and is currently leading a team of international experts to make research more relevant to patients.

Professional Memberships

Mr Alkhaffaf is an active member of the following professional organisations:

– Fellow of The Royal College of Surgeons, Edinburgh

– Association of Upper Gastrointestinal Surgeons of Great Britain & Ireland

– British Obesity & Metabolic Surgery Society

– International Federation for the Surgery of Obesity and Metabolic Disorders

– International Gastric Cancer Association

– European Society of Surgical Oncology

– BASO – The Association for Cancer Surgery

– Faculty of Surgical Trainers

Consultant Bariatric Surgeon

Peter Coe

Mr Peter Coe puts the patient at the centre of his work by empowering people to make the right choice of treatment for them and utilising modern approaches to minimise the impact of surgery.

Mr Peter Coe is a consultant surgeon at Leeds Teaching Hospital Trust. His surgical training took place in Manchester, Leeds and across Yorkshire. During his training he undertook 2 years of research into obesity and cancer risk which resulted in a Doctor of Medicine thesis. Following completion of surgical training, he undertook advanced laparoscopic (keyhole) training in bariatric surgery with Phoenix Health in Chester.

Mr Coe specialises in keyhole surgery for weight loss (bariatric or obesity surgery) as well as for cancers of the oesophagus and stomach. His research interests are in the fields of obesity, oesophageal and gastric cancer and gallstones; he is the co-lead for surgical research for Yorkshire with the National Institute for Health and Research.

Member

  • Association of Upper Gastrointestinal Surgeons (AUGIS)
  • British Obesity and Metabolic Surgery Society (BOMSS)
  • Royal College of Surgeons of England
  • International Society for Diseases of the Esophagus (ISDE)
  • International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO)

Research

Mr Coe’s research includes:

  • A thesis in the field of obesity, cancer risk and the effects of weight loss on this risk
  • Over 50 peer-reviewed publications
  • He is the co-lead for surgical research for Yorkshire with the National Institute for Health and Research
  • He is internationally published and presented, having conducted research in his fields of interest: obesity, oesophageal cancer, gastric cancer and gallstones.

Bariatric Surgeon

Mr Omer-Al-Taan

Mr Omer Al-Taan is a trained bariatric and upper gastrointestinal surgeon. He did his higher surgical training in the East Midlands, at the University Hospitals of Leicester, followed by a focused bariatric fellowship at Musgrove Park Hospital, where he developed his skills for becoming an independent bariatric surgeon.

Omer performs the full range of bariatric procedures (gastric bypass, sleeve gastrectomy, gastric band and gastric balloon) as well as revisional surgery. The bulk of his practice is based on keyhole surgery. His NHS practice is based at Luton & Dunstable University Hospital, which is one of the largest bariatric surgery centres in the UK. Together with weight loss surgery, he regularly performs other operations like laparoscopic cholecystectomy (removal of the gallbladder), inguinal hernia repairs, hiatus hernia repairs, anti-reflux surgery as well as other types of abdominal hernias.

Consultant Specialist Bariatric Surgeon

Sherif Awad

Sherif Awad is Consultant Laparoscopic Obesity & Upper Gastrointestinal Surgeon. He qualified from the University of St Andrews (BMedSci) and University of Manchester (MBChB Hons), undertook his PhD at University of Nottingham and completed his surgical training in Manchester, the East-Midlands and London.

Sherif’s NHS post is based at Royal Derby Hospital, University Hospitals of Derby & Burton NHS Foundation Trust and has worked with Tonic for the past 10 years. Sherif holds/has held numerous high profile and leadership roles including Trustee of British Obesity & Metabolic Surgery Society (BOMSS, Nov 22-Present), Council Member & Professional Educational Lead on BOMSS (Sept 20 – June 24), Service Lead of East-Midlands Bariatric and Metabolic Institute (EMBMI) at Royal Derby Hospital (2016-2021) and Honorary Associate Professor at University of Nottingham (2014-2021). Sherif has a passion for teaching and runs the Royal College of Surgeons of England approved senior Bariatric Surgery Fellowship at EMBMI (which teaches senior trainees to become Consultant Bariatric Surgeons).

To date Sherif has performed over 6000 surgical procedures that include over 2500 bariatric surgery procedures. Sherif is passionate about the care he provides to patients and has over 700 5-star reviews from his private patients. His clinical outcomes, protocols, patient letters and information sheets are exemplary. Sherif is recognised internationally as an expert speaker on improving bariatric surgery pathways and safety.

Click here to watch an interview with a patient of Sherif Awad with a BMI of 90.

Consultant Specialist Bariatric Surgeon

Simon Dexter

Mr Simon Dexter believes that patient safety and quality of life are key goals amidst the changing face of upper GI surgery. These goals are reflected in his teaching and clinical practice.

Mr Dexter has been involved in laparoscopic surgery since its inception in the UK in 1990 and was the UK’s first laparoscopic surgery research fellow. His advanced surgical training took him through Leeds General Infirmary, the Chinese University of Hong Kong, Tufts Medical Center, Boston, USA, and the National Cancer Center Hospital, Tokyo.

Mr Dexter specialises in laparoscopic and oesophago-gastric surgery, and he has a particular interest in laparoscopic obesity surgery, both primary and revisional. Mr Dexter has performed over 1,000 laparoscopic gastric bypass, gastric band, sleeve gastrectomy and duodenal switch procedures. He also regularly undertakes hernia repair and colonoscopy procedures.

He has taught and mentored consultant surgeons across the UK in these techniques and is on the training committee of BOMSS, with responsibility for development of training programmes for UK surgeons. Mr Dexter’s complication rate is one of the lowest in the country for bariatric surgery.

Consultant Bariatric Surgeon

Mr Shamsi El-Hasani

Mr El-Hasani has specialised for the past 32 years in upper gastrointestinal, gallbladder hernia and weight loss procedures.

For the last 32 years Mr El Hasani has mainly specialised in upper gastrointestinal, gall bladder, hernia and weight loss surgery. Mr El-Hasani has long and structured training in laparoscopic/keyhole approach to surgery.

Mr El-Hasani began Private Bariatric surgical services in the year 2000 and currently he is the Director for this service. So far, he has performed in excess of ;1600 laparoscopic gastric bands, 800 laparoscopic gastric bypass, 200 endoscopic insertion of gastric balloon. Also, he performs regularly laparoscopic sleeve gastrectomy and undertakes the management of revisional bariatric surgery.

Mr El-Hasani is closely involved in the surgical management of type 2 diabetes, and he has recent international publication in this field.

Our Weight Loss Surgeries

Our weight loss surgeons specialise in a wide range of weight loss surgeries, including:

Meet Sherif Awad

One of Our Renowned Surgeons

Sherif Awad is a specialist laparoscopic (keyhole), upper gastrointestinal and bariatric (weight loss) surgeon.

He qualified from the University of St Andrews (BSc MedSci) and the University of Manchester (MBChB Hons) and undertook his surgical training in Manchester, the East Midlands and London.

Success stories

Leia’s Weight Loss Story With a Gastric sleeve

“I have lost over 5 stone so far. Everyone is so friendly at Tonic and I wouldn’t go anywhere else. I feel like a new person – and I look like one”

For more real-life stories follow @tonicsurgery.

The UK’s Best Rated Weight Loss Surgery Company

Life changing stories

The UK’s Best Rated Weight Loss Surgery Company

Life changing stories

Ally

10 st (64 kg)*

Weight Loss

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“I have struggled with my weight all of my adult life, I have PCOS and every diet I have tried just wasn’t successful.

I have lost over 10 stone and I feel absolutely incredible. I would never have dreamt to have the life that I currently have now.”

Paul

10 st (64 kg)*

Weight Loss

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“Life before surgery was fake, I had a happy face but was not really happy. I wouldn’t go on lads holidays with my friends or take my kids swimming. 

I have lost over 10 stone and it’s been life changing. I have got my life back. I can now take my kids swimming, go on holiday, do those things that I should have done 10,15,20 years ago.”

Danni

5 1/2 stone (35 KG)*

Weight Loss

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“Before I had surgery, I’d always yo-yoed with my weight. I was ashamed because of the size I’d gotten to. I was unable to buy the clothes I wanted to wear. I didn’t feel like the person that I wanted to be nor did my reflection match the person I felt inside. 

The surgery with Tonic has absolutely changed my life. I’ve lost 5 and a half stone, and I am more confident and outgoing. 

Chanelle

9st (57kg)*

Weight Loss

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“Before weight loss surgery, I couldn’t cope with doing anything strenuous and I couldn’t spend time with my children in the way I wanted to. My eating was out of control, and I had been yo-yoing. 

A year out from surgery, I’m a completely different person. Last year, my body fat percentage was in the morbidly obese category. Now, I’m in the healthy weight category.”

Claire

8 1/2 st (64 kg)*

Weight Loss

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“I lost 8.5 stone. I feel like one of the gym girls, I have done a 10k this year and I am signed up to Brighton half marathon next year! I chose Tonic because I saw so many success stories online and because of the aftercare package. You have the dietician, the PT, the psychotherapist and the constant support group from others who have had surgery and the team in the office”

Our Clinic Locations

Private Weight Loss Surgery Clinics and Bariatric Surgery Specialists Located Across the UK

Wherever you are in the UK, we have weight loss specialists year you.

Are there any weight loss surgery clinics near me?

Start Your Weight Loss Journey Today

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Get in touch with our bariatric specialists on 0115 950 4662

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