Yokohama city University,School of medicine 1968-1974
Keio University ,General & CV surgical trainning 1974-1985
Postgraduate CV Fellow at Univ. of Alabama at Birmingham 1985-1987
London GOS The Hospital for Sick Children, Clinical Fellow 1988-1989
Chief CV surgeon in Kawasaki City Hosp. 1989-2000
Professor & Chairman in Dept of Surgery 2 ,National Defense Medical College,Japan 2000-
