Doctor of Medicine, Sapporo Medical University, Japan, 1985. Doctor of Philosophy, Sapporo Medical University, Japan, 1989.
Research fellow Sloan-Kettering Cancer Center, New York City, 1988—1990. Clinical fellow Sapporo Medical University, Sapporo, Japan, 1990—1992. Physician-in-chief Hokkaido Kitano Hospital, Japan, 1992—1994.
Instructor Sapporo Medical University, Japan, 1994—1998. Director internal medicine Mikasa City Hospital, Japan, 1998—2000. Department of hematology chief Tenshi Hospital, Sapporo, Japan, since 2000.
Fellow: Japanese Society Clinical Hematology, Japanese Society Hematology, Japanese Society Internal Medicine (Young Investigator's award 1998).
Married Naoko Toki, May 8, 1960. Children: Makoto, Eriko.