2001–present:	Visiting Professor, Wakayama Municipal College of Medicine, Wakayama
2012–Present:	Professor, Department of Gastroenterology, Juntendo University
2004–2012:	Associate Professor, Department of Gastroenterology, University of Tokyo
1997–2004:	Assistant Professor, Department of Gastroenterology, University of Tokyo
1996–1997:	Director, Department of Gastroenterology, Chigasaki Municipal Hospital, Kanagawa
1992–1996:	Assistant Professor, Department of Medicine (II), University of Tokyo
1986–1992:	Instructor, Department of Medicine (II), University of Tokyo
1983–1986:	Resident in Medicine & Clinical Fellow in Gastroenterology, Mitsui Memorial Hospital, Tokyo
1982–1983:	Resident in Medicine, University of Tokyo, Tokyo