Harry L.A. Janssen graduated from medical school in Nijmegen, Netherlands. During his study he spent one year as research fellow in Hepatology at the Mayo Clinic. He obtained his PhD at the Erasmus University in Rotterdam on the role of immune modulating therapy in chronic hepatitis B. Following his training in Internal Medicine in Leiden and Gastroenterology at the Erasmus University in Rotterdam, he returned to the Mayo Clinic for a Research Fellowship in Hepatology at the Center of Basic Research in Digestive Diseases. In 2001 he became a faculty member and in 2006 he was appointed as full Professor of Hepatology at the Erasmus University and Chief of the Section Liver Diseases and Transplantation at the Erasmus MC in Rotterdam. After a successful career in Rotterdam, he moved in 2013 to Toronto to become Chief of Hepatology at University Health Network and Professor of Medicine at the University of Toronto, where he also held the Francis Family Chair in Hepatology. In 2016 he merged all three Toronto Liver Programs into the Toronto Centre for Liver Disease to become the biggest liver program in North America, based at Toronto General Hospital. In 2022 Dr. Janssen returned to be Chair and Professor of the Department of Gastroenterology and Hepatology at Erasmus MC, Rotterdam, The Netherlands.