His research accomplishments (with his collaborators) include discovery of the general equation of age structure of population and development of demographic methods based on the equation, development of the line-integral model of decomposition analysis, and development of the life table aging rate analysis and advancement of the theory of log-convex relationship between chronological age and risk of adult human mortality on the individual level. He was born and raised in Tokyo, Japan, and received a Ph.D. from Johns Hopkins. Prior to joining CUNY, he worked at the Office of Population Research at Princeton University, the Population Division of the United Nations, and the Laboratory of Populations at Rockefeller University. At CUNY, he taught several courses including Applied Biostatistics I and Advanced Methods of Demographic Analysis.
PhD in Sociology from Johns Hopkins University, Baltimore, MD
MA in Sociology from Keio University, Tokyo
BA in Sociology from Keio University, Tokyo
Aging and longevity