After graduating from Tokyo University’s Medical Department (1904), he studied in Germany.
Returned to Japan (1910) and became a professor at his alma mater. Was appointed director of the Infectious Disease Research Institute. He was noted for his research in tsutsugamusJii disease, a rickettsial fever endemic in Japan, and cancer. Became vice-president of the Far East Tropical Medicine Association (1921) and then dean of the Medical Department of Tokyo Limversity. Was appointed 12th president of that university (1934). He was a member of the Imperial Academy.
Son of Sensai, a physician.