- 2007 - 2009 Faculty member at Harvard Medical School, Assistant Professor. Harvard titles are continued in MGH and BWH.
- 2009 - President directed Associate Professor, Department of Regenerative Medicine & Transplantation, Faculty of Medicine, Fukuoka University
- 2009 - President directed Associate Professor, Department of Regenerative Medicine & Transplantation, Faculty of Medicine, Fukuoka University
- 2005 - 2007 Faculty member at Harvard Medical School, Instructor in Anesthesiology. Faculty member at Brigham and Women’s Hospital, Research Associate. Faculty member at Massachusetts General Hospital, Assista
- 2003 - 2005 Faculty member at Harvard Medical School, Instructor in Medicine. Faculty member at Massachusetts General Hospital, Assistant in Biology.
- 2000 - 2003 Postdoctoral Fellow, Immunobiology Laboratory Department of Immunobiology Laboratory, Massachusetts General Hospital, Harvard Medical School, MA, U.S.A.
- 1995 - 1996 Chief Resident in Gastroenterology Surgery, Aichi Cancer Center Hospital, Aichi, Japan.
- 1994 - 1995 Resident in Gastroenterology Surgery, Aichi Cancer Center Hospital, Aichi, Japan.
- 1993 - 1994 Surgical staff in Itoshima Hospital of the Japan Medical Association, Fukuoka, Japan.
- 1992 - 1993 Surgical staff in Hakujuji Hospital, Fukuoka, Japan.
- 1991 - 1992 Senior Resident in Anesthesiology and Intensive Care Unit, Kouseikan prefectural hospital, Saga, Japan.
- 1990 - 1991 Junior Resident in Surgery I, Cardiovascular surgery and Radiology, Fukuoka University Hospital, Fukuoka ,Japan.