Dr. Jonas attended the University of Adelaide Medical School in Adelaide South Australia. He undertook his general surgical training at the Royal Melbourne Hospital in Melbourne Australia and subsequently his cardiothoracic surgical training at Royal Children's Hospital in Melbourne and Green Lane Hospital in Auckland New Zealand. After fellowships at the Brigham and Women's Hospital and Children's Hospital Boston he was appointed to the Department of Surgery at Harvard Medical School in 1984. In 1994 Dr. Jonas was appointed to the William E Ladd Chair of Surgery at Harvard Medical School and became the Cardiovascular Surgeon in Chief at Children's Hospital Boston. In 2004 he joined the staff of Children's National Medical Center in Washington DC as the CoDirector of the Children's Heart Institute and Cohen Funger Professor of Cardiac Surgery. In 2005/6 Dr Jonas was the President of the American Association for Thoracic Surgery and in 2009/10 was President of the Congenital Heart Surgeon's Society of North America. He is currently vice-President of the World Society for Pediatric and Congenital Heart Surgery.