2020-:   Professor (Department of Gastroenterological Endoscopy), Department of Gastroenterological Endoscopy, Tokyo Medical University Hospital 2015-2020:   Associate professor (Gastroenterology and Digestive Endoscopy), Division of Digestive Endoscopy, Shiga University of Medical Science Hospital 2011-2015:        Assistant professor (Gastroenterology), First Department of Medicine, Hamamatsu University School of Medicine 2009-2011:        Assistant professor (Gastroenterology), Center for Clinical Research, Hamamatsu University School of Medicine 2008-2009:        Post-doctoral associate, Department of Medicine-Gastroenterology, Michael E DeBakey Veterans Affairs Medical Center and Baylor College of Medicine 2006-2008:     Assistant professor (Gastroenterology), First Department of Medicine, Hamamatsu University School of Medicine 2002-2006:        Graduate School of Hamamatsu University School of Medicine 2001-2002:        Medical Staff in First Department of Medicine, Hamamatsu University School of Medicine, Hamamatsu. 1996-2001:     Medical Staff (Gastroenterology), Seirei Hamamatsu General Hospital, Hamamatsu 1995-1996:     Resident in Internal Medicine, Hamamatsu University School of Medicine, Hamamatsu.