Assistant resident in dermatology Kitasato University, Kanagawa, 1987, resident in dermatology, 1989—1992, fellow in dermatology, 1992—1997, assistant professor department dermatology, 1997. Assistant resident in dermatology Tokyo Metropolitan Geriatric Hospital, 1987—1989, divisionchief in dermatology, 1998-2011. Director in dermatology Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, since 2012.

Atopic dermatitis in older people, human graft versus host reaction (e.g. lichen planus, GVHD), and geriatric skin diseases.