Completed his doctoral studies at the University of Tokyo Graduate School of Humanities and Sociology. He has served as a researcher at the University of Tokyo and a lecturer at Yokohama National University, Azabu University, and other institutions. He is a professional social researcher and a council member of the Society for Human-Animal Relations. His specialty is the sociology and thanatology of pets. He has been the only person in Japan to be responsible for the "pet loss theory" for many years. He has co-edited and written "The Thanatology of Humans and Animals," and co-authored "The University of Tokyo Hachiko Story," "Considering Animal Life," "Development of the Sociology of Emotions," "Animals Encyclopedia," "Companion Animals in Everyday Life," and others.