- 2016/10 - 現在 Saitama Medical Center, Jichi Medical University Division of General Medicine, Department of Comprehensive Medicine 1 Division Head, Professor
- 2008/04 - 2016/09 Saitama Medical Center, Jichi Medical University Division of General Medicine Division Head, Associate Professor
- 2004/04 - 2008/03 Omiya Medical Center Division of General Medicine Assistant Professor
- 2003/01 - 2004/03 Omiya Medical Center, Jichi Medical University Division of General Medicine Research Associate
- 2001/09 - 2002/12 大宮医師会市民病院 内科 科長
- 1998/06 - 2001/08 Omiya Medical Center, Jichi Medical University Division of General Medicine Research Associate
- 1997/06 - 1998/05 Hakodate Kyoaikai Hospital Cardiology Division Head
- 1996/06 - 1997/05 Jichi Medical University
- 1994/06 - 1996/03 Yale University, School of Medicine, Section of Immunology, Boyer Center for Molecular Medicine Postdoctoral fellow
- 1994/06 - 1995/03 長寿科学振興財団平成6年度海外派遣 研究員
- 1992/06 - 1994/05 RISHIRI Island National Health Insurance Center Hospital General Medicine Hospital Director
- 1985/06 - 1994/03 Asahikawa Medical College 1st Department of Internal Medicine Research scholar
- 1990/06 - 1992/05 Asahikawa Medical College 1st Department of Internal Medicine Medical Staff Physician
- 1988/06 - 1990/05 Hokkaido Prefectural Utoro Clinic Superintendent
- 1987/06 - 1988/05 Wakkanai Municipal Hospital Medicine Medical Staff Physician
- 1986/10 - 1987/05 Asahikawa Medical College Hospital General Surgery, Internal Medicine Resident
- 1986/04 - 1986/09 Asahikawa Municipal Hospital Medicine Resident
- 1985/06 - 1986/03 Asahikawa Medical College Hospital Internal Medicine, Anesthesiology, Pediatrics Resident
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THE JAPANESE ASSOCIATION FOR INFECTIOUS DISEASES
, JAPAN PRIMARY CARE ASSOCIATION
, 日本老年医学会
, American College of Physicians
, 日本循環器学会
, 日本内科学会