Department of Community Medicine, University of Ibadan, Nigeria.

Director, Research Center for Overwork-Related Disorders, NIOSH, JOHAS, Japan

Professor of Health Policy and Management, University of Birmingham

Direttore, Dipartimento di Oncologia, Presidio Ospedaliero Universitario, Azienda Sanitaria

Chungbuk National University and Harvard School of Public Health

Chungbuk National University Hospital

Jimma University

University of Pittsburgh Graduate School of Public Health

FGV/EAESP

Professor, Faculty of Medicine, Tohoku Medical and Pharmaceutical University