Kumiko Nonaka is a researcher of Research Team for Social Participation and Community Health at Tokyo Metropolitan Institute for Geriatrics and Gerontology (since June 2006 to present). She received Ph.D. in Sociology from University of California, San Francisco (June 2007). Her work focuses on the effects of social participations on older adults. Memberships include Japanese Society for Study of Social Welfare, Japanese Society of Public Health, Japan Socio-Gerontological Society.