Kiel University Medical School (M.D.1978)
German Navy, Medical Officer, Hyperbaric Medicine (1979)
Hannover Medical School, General Surgery Residency (1980-1984)
Boston Children's Hospital Cardiovascular Surgery Residency (Senior-, Chief- 1984-1986)
Harvard Medical School Boston, Fellow in Surgery (1985)
Hannover Medical School, Cardiothoracic & Vascular Residency (Senior-, Chief- 1986-1988)
Hannover Medical School, Staff Surgeon,Assistant Professor Cardiothoracic Surgery (1988-1993)
Hannover Medical School, Senior Associate, Associate Professor Cardiothoracic Surgery (1993-1994)
Tuebingen University, Professor of Surgery (1995), Director Cardiothoracic & Vascular Surgery (1994-2009), Pediatric Cardiac Surgery (2009-2011)
University of Chicago, Professor of Surgery (2011-2018), Director Pediatric Cardiac Surgery, Adult Congenital Heart Surgery (2011- 2018)
Johns Hopkins All Children's Hospital, Saint Petersburg, FL, Director, Heart Institute, Chief, Cardiovascular Surgery (2018-2019)
Geisinger Heart Institute, Danville, PA, Director Pediatric Cardiac Surgery; Director, Adult Congenital Heart Surgery (2020-present), Professor of Surgery and Pediatrics, Geisinger Commonwealth School of Medicine, Scranton, PA (2021-pres.)
Reconstructive Valve Surgery
Pulmonary Valve Autograft (Ross-Proc.)
Aortic Surgery
Surgery for Congenital Heart Defects (Neonate-Adult)
Pediatric Tracheo-bronchial lesions
Consulting Surgeon National Institute Cardiac Surgery, Astana, Kazakhstan
Yearly Charity Missions Instituto Nacional de Salud del Nino, San Borja, Lima,Peru