3,087 reviewsof the Weight Doctors® Group · 97% recommendation rateWe are the Weight Doctors

Our specialists

Verified specialists near you – surgery, internal medicine and gastroenterology, and skin tightening after weight loss.

Specialists

With us,
your therapy is always in specialist hands.

At Weight Doctors®, surgeons, internists, gastroenterologists and plastic surgeons with long experience in obesity medicine work together. Whether at the Weight Doctors® Nationalklinik in Wertheim or at your nearest Weight Doctors® location. In all 5 countries, always under the principle of specialist-led care.

  • 39doctors in 5 countries
  • 2former presidents of the world obesity federation IFSO
  • 60.000+treatments supported
Dr. med. Oliver Scheffel
Surgery

Dr. med. Oliver Scheffel

Group CMO · Director of National Obesity Centre · Lead Surgeon

Specialist in general and bariatric surgery

Gastric bypass, gastric sleeve and revision operations

The challenge in modern obesity medicine today lies in making the most suitable therapy possible for each of our patients. Never before has there been a greater number of such effective and promising approaches.

  • Previously clinic director at the Obesity Centre of Excellence at Sana-Klinikum Offenbach
  • Additional qualification in obesity surgery since 2015
  • Since 2018 scientific director of a further training course of the German Society for General and Visceral Surgery
  • Author of numerous specialist publications and congress contributions

GermanyNetherlandsDortmund · Wertheim · Hamburg

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Prof. Dr. med. Karl Miller
Surgery

Prof. Dr. med. Karl Miller

Global Medical Director · Lead Surgeon

Specialist in general and visceral surgery

Past President of the global federation for obesity surgery (IFSO)

A minimally invasive obesity treatment is not the final solution for every patient on the way to a sustainably healthy life. But in my decades of work with many unhappy people, I have learned that for most of them such a step was the necessary prerequisite.

  • More than 4,000 obesity patients treated minimally invasively
  • Over 110 publications and book contributions
  • Co-initiator of the Weight Doctors SLEEVE®
  • From 2001 to 2015 chief physician of surgery at Hallein Hospital (Salzburg)

GermanyAustriaWertheim · Dortmund

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Priv.-Doz. Dr. med. Dörte Wichmann
Surgery

Priv.-Doz. Dr. med. Dörte Wichmann

Lead Surgeon

Specialist in visceral surgery & expert in endobariatrics

Endoscopic obesity therapy

hydroGMA® is endoscopic precision work: we treat only the uppermost layer of mucosa – exactly where the hunger cells sit. No incision, no suture. For many patients, it is the gentle entry point they have long been waiting for.

  • Since October 2025 senior physician at the Weight Doctors® Nationalklinik, building up the endoscopy centre
  • Endoscopy experience at the Central Endoscopy Unit of Tübingen University Hospital
  • Research in experimental endoscopy (Tübingen University Hospital)
  • Guest on the specialist podcast “Good Morning Endoscopy!” on endoscopic obesity therapy
Maksims Margolins
Surgery

Maksims Margolins

Specialist in general surgery

Bariatric surgery

  • Senior physician in general, visceral and vascular surgery at the Weight Doctors® Nationalklinik
  • Senior physician at the obesity centre of the Weight Doctors® Nationalklinik
  • Focus: gastric bypass and gastric sleeve
Mohamad Shalabi
Surgery

Mohamad Shalabi

Specialist in general and visceral surgery

Obesity surgery and general and visceral surgery

  • Senior consultant at the obesity centre of the Weight Doctors® Nationalklinik
  • Focus: abdominal surgery and minimally invasive procedures
Dr. med. Robert Jenner
Surgery

Dr. med. Robert Jenner

Specialist in visceral surgery / specialised visceral surgery

Stomach reduction, gastric balloon and GLP-⁠1 therapy

With us, every therapy begins with a comprehensive medical examination. We create individual treatment plans, take all relevant concomitant conditions into account and personally accompany our patients throughout their treatment.

  • Medical studies in the first intake at the Asklepios Campus Hamburg of Semmelweis University (2008–2012)
  • Specialist training in general and visceral surgery in Hamburg and Reinbek (2012–2019)
  • From 2020 senior physician for gastrointestinal and colorectal surgery and lecturer at the Asklepios Campus Hamburg

GermanyNetherlandsDüsseldorf · Dortmund

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Dr. med. Gerhard Schüder
Surgery

Dr. med. Gerhard Schüder

Specialist in general, visceral and vascular surgery / specialist in specialised visceral surgery

Medical Director and chief physician of surgery at the Weight Doctors® Nationalklinik

Empathy, precision and interdisciplinary collaboration are at the heart of our work.

  • 1998–2016 in Wertheim, including 13 years as Medical Director
  • Then chief physician of general and visceral surgery at Tauberbischofsheim Hospital
  • Focus: hernia, gallbladder and bowel surgery, vascular surgery and proctology
Ahmed Saber
Surgery

Ahmed Saber

Specialist in orthopaedics and trauma surgery

Senior consultant

My aim is to bring my experience in orthopaedics, trauma surgery and spinal surgery to bear and, together with the team, to continue developing modern, reliable and patient-centred care for the region.

  • Since May 2026 senior consultant for trauma surgery & orthopaedics at the Weight Doctors® Nationalklinik
  • Specialist in orthopaedics and trauma surgery since 2024
  • FEBOT – Fellow of the European Board of Orthopaedics and Traumatology
  • Previously senior physician for spinal surgery at Klinikum Hochrhein
Prof. Dr. Jan Willem Greve
Surgery

Prof. Dr. Jan Willem Greve

Medical Director Netherlands · Lead Surgeon

Specialist in visceral and bariatric surgery

Professor of Metabolic and Bariatric Surgery, Maastricht University

Obesity is a chronic disease that, in most patients, has multifaceted causes.

  • Professor of Metabolic and Bariatric Surgery at Maastricht University
  • President of the global federation for obesity surgery (IFSO) 2005–2006
  • More than 220 articles in international specialist journals
  • Holder of the Order of Orange-Nassau
Dr Matthew Hannington
Surgery

Dr Matthew Hannington

Specialist in surgery

General surgery and endobariatrics in Cape Town

  • Medical degree at the University of the Witwatersrand, graduating in 2011 (MBBCh)
  • Specialist in general surgery since 2021 (FCS(SA)), further training at the University of Cape Town
  • 2022 Master of Medicine (Surgery) in Cape Town and ChM of the University of Edinburgh
  • Trained in Germany in gastric balloon and endoscopic sleeve gastroplasty
Dr. med. Barbara John, FEBGH
Internal medicine & gastroenterology

Dr. med. Barbara John, FEBGH

Specialist in internal medicine & gastroenterology

Fellow of the European Board of Gastroenterology and Hepatology

I look forward to being able, together with my team, to provide patients with high-quality care across a broad spectrum.

  • Since 1 October 2025 chief physician of internal medicine at the Weight Doctors® Nationalklinik
  • Previously for almost ten years chief physician of internal medicine at Leonberg Hospital
  • DEGUM trainer for endosonography and DEGUM tutor for sonography
  • Additional qualifications including emergency medicine and nutritional medicine (DGVS)
Dr. med. Roland Mörmel
Internal medicine & gastroenterology

Dr. med. Roland Mörmel

Specialist in internal medicine

Information and medical aftercare

Alongside the professional delivery of our permanent and temporary obesity treatment solutions, meticulous, patient-centred aftercare is a matter particularly close to my heart.

  • Responsible for the consultation concept, patient information and medical aftercare
  • Certified practitioner for the Weight Doctors SLEEVE®
  • Specialist in the gastric balloon for 6 and 12 months

GermanyNetherlandsDortmund · Düsseldorf · Wiesbaden · Waalre

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Prof. Dr. med. Deniz Uyak
Internal medicine & gastroenterology

Prof. Dr. med. Deniz Uyak

Specialist in internal medicine and emergency medicine

Gastric balloon since 2007

Since 2007 I have been accompanying patients through treatment with the modern gastric balloon. In more than 15 years I have performed around 5,000 procedures and, once the wearing time was over, been able to look many happy people in the eye as they took the step into a new life.

  • Around 5,000 gastric balloon procedures
  • Experience with the adjustable gastric balloon for 12 months
  • Previously permanent deputy chief physician of the Internal Department at St.-Willehad-Hospital Wilhelmshaven
Dr. med. Hans Werner Sudholt
Internal medicine & gastroenterology

Dr. med. Hans Werner Sudholt

Specialist in internal medicine

Gastric balloon and endoscopy

  • From 1985 to 2012 chief physician of the Internal Department at Wertheim Hospital
  • Several thousand gastric balloon treatments since the late 2000s
  • Co-author of the standard works “Endosonographie” (Thieme)
Erio Becker
Internal medicine & gastroenterology

Erio Becker

Specialist in internal medicine

Gastric balloon and endoscopy

  • Over 13,000 endoscopic procedures over his career
  • 26 years senior physician of the Internal Department at Rotkreuz-Klinikum Lindenberg
  • Supervises gastric balloon programmes over 6 and 12 months
Dr. Nava Zimmer
Internal medicine & gastroenterology

Dr. Nava Zimmer

Specialist in internal medicine / gastroenterology

Specialist contact at the Hamburg location

  • Specialist in internal medicine since 2020, in gastroenterology since 2022
  • 2021–2024 senior physician for internal medicine and gastroenterology at Westküstenklinikum Heide
Mohammad Al Rashdan
Internal medicine & gastroenterology

Mohammad Al Rashdan

Specialist in internal medicine & gastroenterology

Senior consultant for internal medicine and gastroenterology at the Weight Doctors® Nationalklinik

  • Focus: gastroenterology, endoscopy and gastrointestinal diseases
  • In the “Internal Medicine & Endoscopy” team under chief physician Dr. med. Barbara John, FEBGH
Mamoon Al Hamed
Internal medicine & gastroenterology

Mamoon Al Hamed

Specialist in internal medicine & gastroenterology

Senior physician of internal medicine at the Weight Doctors® Nationalklinik

  • In the “Internal Medicine & Endoscopy” team under chief physician Dr. med. Barbara John, FEBGH
Dr. Jan Willem Straathof
Internal medicine & gastroenterology

Dr. Jan Willem Straathof

Specialist in gastroenterology & hepatology

Obesity medicine and endobariatrics

  • Registered in the Dutch BIG register as a specialist in gastrointestinal and liver diseases
Dr. Devinder Bansi
Internal medicine & gastroenterology

Dr. Devinder Bansi

Medical Director UK

Specialist in gastroenterology

Medical Director of Weight Doctors® in the United Kingdom

  • On the UK specialist register (GMC) for gastroenterology and internal medicine since 1998
  • Research Fellow in gastroenterology at the John Radcliffe Hospital in Oxford, MD doctorate
  • Consultant at Hammersmith Hospital, Honorary Senior Lecturer at Imperial College London
  • Fellow of the Royal College of Physicians (FRCP), member of the British Society of Gastroenterology
Dr Mahesh Naidu
Internal medicine & gastroenterology

Dr Mahesh Naidu

Specialist in internal medicine

High blood pressure, diabetes, bariatric medicine and intensive care medicine

  • Over 25 years of experience as a specialist in internal medicine (Specialist Physician)
Dr. med. Uwe Herrboldt
Plastic surgery

Dr. med. Uwe Herrboldt

Specialist in plastic and aesthetic surgery

Tightening procedures after major weight loss

  • Several decades of surgical experience
  • Member of the DGPRÄC

GermanyDortmund · Wertheim

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Dr. med. Martin Reifenrath
Plastic surgery

Dr. med. Martin Reifenrath

Specialist in plastic and aesthetic surgery

Lead physician for plastic and aesthetic surgery in Wertheim

The decisive difference lies not in the procedure alone but in how we shape the result together – with honest information, realistic expectations and the right medical options.

  • Specialist since 1997, additional qualification in hand surgery since 2000
  • 2000–2015 chief physician of plastic and aesthetic surgery at Ev. Krankenhaus Lütgendortmund
  • Member of the DGPRÄC, languages: German, English, French

GermanyDortmund · Wertheim

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Dr. med. Maria Simidjiiska
Plastic surgery

Dr. med. Maria Simidjiiska

Specialist in plastic and aesthetic surgery

Tightening operations, liposuction and lipoedema surgery

After massive weight loss, it is not a matter of skin tightening alone but of restoring balance – between form, function and self-perception

  • Services include tummy tuck and breast lift, liposuction and lipoedema surgery
  • Advises on skin tightening with and without surgery
  • Member of the DGPRÄC

GermanyDortmund · Wertheim

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Dr. med. Jutta Henscheid
Plastic surgery

Dr. med. Jutta Henscheid

Doctor

Skin tightening after major weight loss

First an honest stocktake: what bothers you, and is it really a local fat pad? Then a conversation with a specialist who assesses the skin – where elasticity is low, a lift is sometimes the better answer.

  • Licensed to practise 1998, doctorate 2002
  • Own practice in Düsseldorf since 2002
  • Gives further training courses for doctors

GermanyHamburg · Wertheim

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Dr. med. Martin Koch
Plastic surgery

Dr. med. Martin Koch

Specialist in surgery

Operations after major weight loss

  • Licensed to practise 1987, doctorate 1995, specialist in surgery since 1996
Lic. Lorena Hierner
Plastic surgery

Lic. Lorena Hierner

Expert in post-bariatric skin tightening

Tightening operations, liposuction and lipoedema surgery

  • In the team at the Düsseldorf location
  • Services include lipoedema surgery, tummy tuck and breast lift
Dr. med. Michael Bromba
Plastic surgery

Dr. med. Michael Bromba

Specialist in plastic and aesthetic surgery

Chief physician for plastic and aesthetic surgery and post-bariatric surgery in Wertheim

Lipoedema is not a question of lifestyle – it is a disease. And every patient deserves well-founded information on which treatment routes and financing options are open to her.

  • 1996–2023 chief physician of plastic and aesthetic surgery at St. Josef Hospital Essen-Kupferdreh
  • Member of the DGPRÄC and the VDÄPC

GermanyDortmund · Düsseldorf · Wertheim

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Dr. med. Frank Gruner
Plastic surgery

Dr. med. Frank Gruner

Specialist in plastic and aesthetic surgery

Body-contouring surgery and lipoedema surgery

  • For many years chief physician of the Department of Plastic, Aesthetic and Hand Surgery in Oberhausen
  • Medical studies at Katholieke Universiteit Leuven (Belgium)
  • Authorised to provide specialist training in plastic and aesthetic surgery
  • Member of the DGPRÄC

GermanyNetherlandsDortmund · Düsseldorf · Waalre

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Prof. Dr. med. Mathias Witt
Plastic surgery

Prof. Dr. med. Mathias Witt

Specialist in plastic and aesthetic surgery

Post-bariatric body contouring in Wertheim

I am particularly attracted by the opportunity to help build up plastic-reconstructive and post-bariatric surgery at a new location of a group of companies in which medical quality, short distances and collaborative partnership are highly valued.

  • In the team of the Wertheim obesity centre for tightening procedures after weight loss
  • Previously senior physician in Castrop-Rauxel and head of the Reconstructive Lymphatic Surgery section
  • Habilitated; also a qualified lawyer (Diplom-Jurist) and Magister artium (classical philology)
  • Volunteer with INTERPLAST-Germany, most recently in Rwanda in August 2026

GermanyDortmund · Düsseldorf · Wertheim · Nuremberg

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Dr. med. univ. Nura Zamani
Plastic surgery

Dr. med. univ. Nura Zamani

Specialist in plastic and aesthetic surgery

Breast surgery, lipoedema surgery and tightening operations

  • Services include liposuction, lipoedema surgery and tummy tuck
  • In the team at the Dortmund location
Dr. med. Stephan Klarner
Plastic surgery

Dr. med. Stephan Klarner

Specialist in plastic and aesthetic surgery

Tightening operations, liposuction and lipoedema surgery

  • From 2018 specialist training and senior physician at BG Klinikum Hamburg
  • Then senior physician of plastic surgery at Hamburg-Eppendorf University Hospital
  • In Hamburg since April 2022
  • Full member of the DGPRÄC
Dr. med. Karina Baier
Plastic surgery

Dr. med. Karina Baier

Specialist in plastic and aesthetic surgery

Aesthetic surgery of the face, breast and body

  • Studied human medicine at Heinrich Heine University Düsseldorf
  • From 2020 specialist training at BG Klinikum Hamburg
  • Most recently specialist in plastic surgery at Dermatologikum Hamburg
  • Member of the DGPRÄC
Dr. med. Katharina Dette-Oltmann
Plastic surgery

Dr. med. Katharina Dette-Oltmann

Specialist in plastic and aesthetic surgery

Tightening operations, liposuction and lipoedema surgery

  • Training at Heidelberg University Hospital and at University Hospital Zurich
  • From 2015 senior consultant in plastic surgery, Barmherzige Brüder Regensburg
  • Also a specialist in general medicine, additional qualification in hand surgery
  • Full member of the DGPRÄC
Dr. med. Cornelius Schubert
Plastic surgery

Dr. med. Cornelius Schubert

Specialist in plastic and aesthetic surgery

Aesthetic surgery of the breast, face and body

  • Senior physician at Asklepios Kliniken Hamburg, co-founder of a centre for post-bariatric tightening procedures
  • Specialist in 2020, FEBOPRAS 2021, additional qualifications in hand surgery and emergency medicine
  • 2023 fellowship in aesthetic surgery at Akademikliniken Stockholm
  • Member of the DGPRÄC and the German Society for Senology
Dr. med. J. Philipp Neis
Plastic surgery

Dr. med. J. Philipp Neis

Specialist in plastic and aesthetic surgery

Body-contouring procedures

  • Training at University Hospital Schleswig-Holstein in Lübeck, most recently as senior physician
  • Specialist since 2022, additional qualification in hand surgery
  • In Hamburg since January 2025
  • Member of the DGPRÄC and the Professional Association of German Surgeons (BDC)
Dr. Iris Lebbe
Plastic surgery

Dr. Iris Lebbe

Specialist in plastic surgery

  • Registered in the Dutch BIG register as a specialist in plastic surgery
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Specialist principle

Three benchmarks for your treatment.

Who treats you with us, how we select specialists and who has to give approval before a procedure – from our 13 reasons for Weight Doctors®.

  1. Six-eyes principle

    For honest advice and the right patient selection: before we recommend a treatment, three professionals check whether it suits you – your specialist adviser, your treating specialist and an anaesthetist experienced in obesity medicine.

    1. Specialist adviser1st approval
    2. Treating specialist2nd approval
    3. Anaesthetist3rd approval
    4. Your treatmentonly with all three
  2. Consultant-led care

    Many of our specialists have led clinics or departments – as chief physicians, clinic directors or senior consultants.

    For example
    • Dr. med. Oliver Scheffel
    • Prof. Dr. med. Karl Miller
    • Dr. med. Gerhard Schüder
    • Dr. med. Barbara John, FEBGH
    • Dr. med. Hans Werner Sudholt
    • Dr. med. Martin Reifenrath
    • Dr. med. Michael Bromba
    • Dr. med. Frank Gruner

    Dr. Scheffel · Prof. Miller · Dr. Schüder · Dr. John · Dr. Sudholt · Dr. Reifenrath · Dr. Bromba · Dr. Gruner

  3. Training and verification

    Every specialist goes through a four-stage Weight Doctors® curriculum developed by our leadership team on the basis of more than 15 years of experience. They may treat patients with us only after the endorsement of at least two Lead Surgeons.

    1. Level1
    2. Level2
    3. Level3
    4. Level4
    5. Weight Doctors® verification for treatment – with the vote of at least two Lead Surgeons

    Lead Surgeons: Dr. Scheffel · Prof. Miller · Prof. Greve · PD Dr. Wichmann

Specialisms

Three specialisms,
one team.

Surgery, internal medicine & gastroenterology and plastic surgery – who treats in which field and which pages our doctors have reviewed.

Where our doctors treat

6 of them treat in two countries and are counted in both. Tap a country to see only its doctors at the top.

Consultation

On to your Weight Doctors® Experience.

The first step is a conversation: choose your treatment, location and appointment online here – consultation on site, by video or by phone.

  • 100% no obligation
  • One-to-one with your specialist
  • Appointments online, around the clock
  • 23 locations in 6 countries

Prefer to call? 0330 808 9973Mon–Fri 8 am–8 pm · Sat 9 am–3 pm

Weight Doctors® at 23 locations in 6 countries23 locations

Which location is closest to you?

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