Director Cardiac Surgery Simulation Training & Humanitarian Cardiac Surgery - Global Heart Care 2021, CEO/Founder Global Heart Forum and German African Heart Forum, German HeartCebter Berlin (2014)
Consultant cardiothoracic & vascular surgeon, German Heart Center. Berlin 1986-2012
International cooperation, intern. cardiovasc videoconf. (2012)
President, Pan-African society for cardiothoracic surgery (2011)
Professor and consultant, University of Cape Coast, Ghana (2007)
Initiated African heart seminar with Dr. Koen at Christian Barnard Memorial Hospital, Cape Town, (2004)
Professor of Surgery, Charite Univ of Medicine, Humboldt University (1998)
Award of National Inst. of Health, Bethesda USA - Immunology of allograft valve surg. (1990)
Consultant CT surgeon, German Heart Center Berlin, Thoracic & Cardiovascular Surgery (1986)
Board Certification: Cardiothoracic & Vascular Surgery (1986)
J.F.K. Medical Center, Monrovia, Liberia, Consultant in Cardiothoracic Surgeon (1979-1980)
Board Certification: General surgery (1975), vascular surgery (1979)
Senior Resident, University Hospital Kiel, Department of Cardiovascular Surgery (1977-1979, 1980-198
Hospital for Sick Children, Thoracic Unit, Great Ormond Street, London, Hon. Senior Registrar (1976)