Isei Obata graduated from Tokyo University (1908).
Isei Obata became member of Hamada Hospital at Surugadai, Tokyo (1909) and studied obstetrics and gynecology under the late Dr. Gentatsu Hamada and became director of the hospital. He was a chairman of the Tokyo Physicians Society. Received his M.D. (1917). Author of "Nine Studies on Cancer of the Uterus," etc.