Washington University General Surgery Residency (1986-1990)
Washington University Cardiothoracic Research Lab (1990-1992)
Washington University Cardiothoracic Residency (1992-1994)
W.U./St. Louis Children's Pediatric Cardiothoracic Fellowship (1994-1995)
Assistant Professor of Surgery University of Miami (1995-1997)
Director Pediatric Cardiac Surgery Joe DiMaggio Children's Hospital (1997-2000)
Cardiac Surgeon Children's Hospital of Wisconsin (2000-2005)
Professor of Surgery, Chief of Pediatric Cardiac Surgery Arkansas Children's Hospital (2005-2010)
Professor of Surgery, Chief of Pediatric Cardiac Surgery, Duke University School of Medicine (2010-2016)
Professor of Cardiovascular and Thoracic Surgery, Chief of Pediatric and Congenital Cardiothoracic Surgery, UT Southwestern (2017-2025)
Co-Director Herma Heart Institute and Congenital Heart Surgery, Children's Wisconsin, Professor of Surgery Medical College of Wisconsin (2025-present)