I will be retiring from my position in the Department of Public Health in Sapporo Medical University's School of Medicine at the end of March 2017. From April 2017, I will work at Hokkaido Chitose College of Rehabilitation in the capacity of rector. The present paper is an overview of my research on the past, present and future of public health. I believe that there is a common concept between enterprise management and research execution. For example, the results of research should be published periodically and should contribute to the public wellbeing. My career on research started in 1978 focusing primarily on the epidemiology of ovarian cancer. The scope of this research subsequently expanded to include the epidemiology of prostate cancer by 1999. At present, I am participating in the Japan Multi-Institutional Collaborative Cohort Study (J-MICC Study), a large cohort study for evaluating risk factors of cancer. In addition, I have conducted research on health promotion for the elderly since 2003, and have examined unique programs such as the Fumanet Exercise. I would like to participate in research on preventive rehabilitation that focuses on helping the frail elderly maintain and strengthen residual physical and mental functions. Moreover, I also hope to continue my research on occupational and environmental health.