2018/10 - Today Teikyo UniversityGraduate School of Public HealthProfessor
2014/04 - 2018/09 Teikyo UniversityGraduate School of Public HealthAssociate Professor
2012/04 - 2014/03 Yokohama City University, School of MedicineDepartment of Epidemiology and Public HealthAssociate Professor
2011/09 - 2012/03 The International university of health and welfareClinical research center SANNO hospitalAssociate professor
2008/12 - 2011/08 The National Center for Global Health and MedicineDepartment of medical cooperationTechnical officer
2007/04 - 2008/11 Ministry of Health, Labour and WelfareForeign Affairs devision, Minister's Secretariat,Deputy director
2003/04 - 2007/03 Juntendo University, School of MedicineDeaprtment of Public HealthAssociate Professor
2001/07 - 2003/03 Imperial Foundation "BOSHI-AIIKU-KAI"Rreserach resident
1999/04 - 2001/07 Chibanishi General HospitalDepartment of PediatricsStaff Doctor
1995/10 - 1998/01 Tokunoshima Tokushukai hospitalDepartment of PediatricsResident doctor
1994/06 - 1995/09 The University of Tokyo HospitalDepartment of PediatricsJunior resident