1974 ~ 1980  Yamaguchi University School of Medicine, MD

1980 ~ 1986  Department of Pediatrics, National Okayama Hospital

1986 ~ 1988  Research Fellow, University of Oklahoma Health Science Center, 

                             Oklahoma City, OK, USA

1988 ~ 1989  Department of Pediatrics, National Kure Hospital

1989 ~ 2001  Vice Director, Department of Pediatrics, Saiseikai Shimonoseki General 

                             Hospital

2002~ 2006  Professor, Department of Pediatrics, Kawasaki Medical School

2006 ~ 2021  Chairman, Department of Pediatrics, Kawasaki Medical School

2021 ~  Professor emeritus, Kawasaki Medical School ,

   Specially Appointed Professor, Kawasaki University of Medical Welfare

The Auditor of Japanese Society of Pediatrics

The Former president of Japanese Society for Pediatric Infectious Diseases

The Former president of Japanese Society of Travel and Health