1991–1992
Fellow in Orthopedic Surgery and Traumatology, Lubinus Klinik Kiel. Clinical focus on: sports traumatology, joint arthroscopy, joint reconstruction.

1993–1994
Fellow in General Surgery, Burg a. F.
Clinical focus on: joint reconstruction, traumatology, established a new sports trauma dept.

1994–1997
Consultant at the Medical University of Lübeck/Germany. 
Clinical focus on: joint reconstruction, introduction of advanced joint preserving, arthroscopy with shoulder and knee reconstructions, Joint stabilisation techniques, joint reconstruction, joint replacement, paediatric orthopaedic surgery, tumour surgery.

1997–2006
Senior Consultant and Vice Chairman and Associate Professor at the Technical University of Munich, Dept. of Orthopedic Surgery and Sports Traumatology.
Clinical focus on: joint reconstruction, advanced joint arthroscopy, advanced joint preserving
surgery, joint replacement, hip/knee/ shoulder, paediatric orthopaedic surgery, tumour surgery.

Since 2006 
Chairman of MARE Clinic Dept. of Joint Replacement & Spine Surgery. 
Clinical focus on: joint reconstruction, advanced joint preserving surgery, joint replacement, hip/knee/shoulder, paediatric ortho- paedic surgery, tumour surgery, spine surgery.

Since 2006 
Senior Consultant and Associate Professor at the Technical University of Munich, Dept. Of Orthopedic Surgery and Sports Traumatology. 
Clinical focus on: joint reconstruction, minimally invasive surgery, advanced joint arthroscopy, advanced joint preserving surgery, joint replacement, hip/knee/shoulder, paediatric orthopaedic surgery, tumour surgery.

Since 2010 
Chairman and Associate
Professor at the Medical University of Kiel.
Clinical focus on: joint reconstruction, minimally invasive surgery, advanced joint preserving surgery, joint replacement, hip/knee/ shoulder, advanced techniques in rheumatology, tumour surgery.