- 2021/04 - 現在 Teikyo Heisei University Faculty of Health and Medical Science
- 2003/04 - 2021/03 Teikyo University School of Medicine
- 2003/04 - 2021/03 Department of Microbiology & Immunology, Teikyo University School of Medicine, Professor & Chairman
- 2003/04 - 2021/03 帝京大学附属病院内科外来診療教授(感染症)
- 2003/04 - 2021/03 Teikyo University
- 1999 - 2003 Teikyo University School of Medicine
- 1999 - 2003 Department of Microbiology & Immunology, Teikyo University School of Medicine, Associate Professor
- 1995 - 1999 Teikyo University School of Medicine
- 1995 - 1999 Department of Internal Medicine, Teikyo University School of Medicine, Assistant Professor
- 1994 - 1995 Teikyo University School of Medicine
- 1994 - 1995 2nd Department of Internal Medicine, Teikyo University School of Medicine, Assistant
- 1993 - 1994 米国カンサス大学内科感染症部門 研究員
- 1993 - 1994 Department of Infectious Diseases, Kansas University Medical Center, Visiting research
- 1992 - 1993 The University of Tokyo The Institute of Medical Science
- 1992 - 1993 Department of Bacterial Infection, The Institute of Medical Science, The University of Tokyo, Researcher
- 1985/04 - 1992 Teikyo University School of Medicine
- 1985 - 1992 2nd Department of Internal Medicine, Teikyo University School of Medicine, Assistant
- 1981/05 - 1984/05 The University of Tokyo The Institute of Medical Science