Since 2011
Director of the Dept. Of Medicine - Gastroenterology, Hepatology and Diabetology, Vivantes Neukölln Hospital, Berlin, Germany
2007 - 2011
Deputy head, Dept. Of Medicine-Gastroenterology, Hepatology and Infectious Diseases-, University Medical Centre Mannheim, Germany
Since 2006
Eo. Professor at the University of Heidelberg, Germany
1992 - 2006
University MedicalCenters Essen and Mannheim, Germany/ UNC Chapel Hill, USA