Dr. Tsutsumi is a leading researcher of occupational stress and is engaged in several international committees, including the International Commission on Occupational Health (past chair of the Scientific Committee of Cardiology in Occupational Health) and Chair of the International Collaborations Committee of the International Society of Behavioral Medicine. He has long focused on occupational health and is extending his efforts to psychosocial factors and actions that affect health, along with the social determinants of health that are difficult to solve by the health sector alone. Through epidemiology that targets humans as a pillar of research methodology, he is motivated to contribute to society through “practical science” derived from research results. His laboratory also aims to elucidate the mechanisms of social disparity in workers’ health, the health effects of occupational stress and its prevention, and the health effects of workers affected by corporate culture.