University Hospital Aachen
- 1992 – 1993: Clinical Fellowship in Infectious Diseases, Beth Israel Hospital, Harvard University, Boston, USA
- 1994 – 1997: Internship at the Institute for Infectious Diseases and Environmental Medicine, University Hospital Freiburg, Germany
- 1996: Specialization in Medical Microbiology and Epidemiology
- Since 1997: Head of the Department for Infectious Diseases and Infection Control, University Hospital Aachen, Germany
- 1998: Specialization in Infection Control and Environmental Medicine
- 2006: Professor of Medicine at the University of Aachen, Germany
- Since 2009: Head of the Center for Infectious Diseases (German Society for Infectious Diseases), University Hospital Aachen, Germany