Doctor of Medicine, Shinshu University, Matsumoto, Nagano, Japan, 1991. Doctor of Philosophy of Medical Science, Shinshu University, Matsumoto, Nagano, Japan, 2000.
Resident in internal medicine 3d Department Medicine, Shinshu University School Medicine, Matsumoto, 1991, Kenwakai Hospital, Ida, Japan, 1992. Medical staff internal medicine Komoro Kousei General Hospital, 1993, Fukuyama Cardiovasc. Hospital, 1994; medical staff internal medicine neurology Kakeyu Hospital, JA Nagano Koseiren Kakeyu-Misayama Rehabilitation Center, Ueda, since 1995.
Member of Society for Neurosci., Neuropsychology Association Japan, Japanese Neurosci. Society, Japanese Society Neurology (certified Board Clinical Neurology).
Married Hiroko-Masatsuka Katai, March 24, 2001. 1 child Haruka.