Diagnosis, therapy and prevention of diseases of the gastrointestinal tract, as well as the related organs of the liver, gall bladder and pancreas.

Ulcer diseases, such as gastric ulcer and duodenal ulcer

Tumours of the digestive tract (colon carcinoma)

Liver diseases such as cirrhosis and hepatitis

Coeliac disease and inflammatory bowel diseases such as Crohn's disease and ulcerative colitis

Functional disorders such as functional dyspepsia and irritable bowel syndrome

Consultant at GastroZentrum Hirslanden Zürich (CH)

Research stay at Showa University Yokohama (JPN)

Research stay at the National Cancer Center Tokyo (JPN)

Deputy Director of the Clinic and Polyclinic for Interdisciplinary Endoscopy, University Medical Center Hamburg-Eppendorf (DE)

Editorial Board; Video Journal & Encyclopedia of GI Endoscopy (VGJI) 

International Committee, American Society of Gastrointestinal Endoscopy (ASGE) 

European Society of Gastrointestinal Endoscopy (ESGE)

Advisory Board, German Society for Endoscopy and Imaging Techniques (DGE-BV)

Swiss Society of Gastroenterology (SGG)

RFA Academy, Training Centre of the "European Radiofrequency Ablation Training Programme 

Websurg Faculty, IRCAD Institute Strassbourg, European Institute of TeleSurgery

EndoSwiss

Editorial Board, Gastrointestinal Endoscopy (2005-2010)

2004 Indian Society of Neuroradiology Award for Methods of 3D Neuroanatomy Visualization 

2002 Golden Mile Award der European Society of Neuroradiology for Model-Enhanced Neuroanatomy 

2001 Singapore Enterprise Challenge Award des National Science and Technology Board für die Entwicklung minimalinvasiver Neurochirurgie mit Augmented Reality Navigation 

ERCP - bile duct endoscopy (stenting, lithotripsy, cholangioscopy)

Endosonography (puncture, pancreatic pseudocyst and abscess drainage)

Endoscopic resection of adenomas and early carcinomas (EMR, ESD)

Peroral endoscopic myotomy (POEM)

Radiofrequency ablation for Barrett's oesophagus

Zenker diverticulotomy

Endoluminal vacuum therapy