- 2006 - -岩手医科大学外科学講座教授
- 2001 - 2005 Assistant Professor in Surgery, Keio University School of Medicine, Tokyo
- 1997 - 2005 Visiting Scientist, Department of Molecular Biology, Keio University School of Medicine, Tokyo
- 1993 - 2005 Chief, Transplantation Biology Section, Division of Transplantation, Department of Surgery, Keio University School of Medicine, Tokyo
- 2005 - -岩手医科大学医学部外科学第一講座教授
- 2005 - - Professor and Chairman, Department of Surgery, Iwate Medical University School of Medicine, Iwate
- 1993 - 2001 大学助手(医学部外科学)
- 1993 - 2001 Instructor in Surgery, Keio University School of Medicine, Tokyo
- 2001 - - 大学専任講師(学部内)(医学部外科学)
- 1988 - 1992 大学医学部助手(外科学)
- 1989 - 1990 Instructor, Geographic Medicine and Infectious Diseases, Department of Medicine, Tufts University and New England Medical Center, Boston
- 1988 - 1990 Research Fellow, Department of Surgery, Harvard Medical School and Massachusetts General Hospital, Boston
- 1987 - 1988 大学助手(医学部外科学)
- 1984 - 1988 大学医学部助手(専修医)(外科学)
- 1982 - 1984 大学医学部研修医(外科)
- (外科系講座再編により外科学第一講座より外科学講座へ名称変更)