Professor Tajiri specializes as Professor in the Department of Innovative Interventional Endoscopy Research at the Jikei University School of Medicine, Tokyo, Japan. He emerged from Hokkaido University School of Medicine in Sapporo, Japan, in 1976, and justified question mutual chance at the Department of Internal Medicine at Cancer Institute Hospital and the Endoscopy Division at National Cancer Center Hospital in Tokyo. In 1995, he launched National Cancer Center Hospital East as the Chief of the Endoscopy Division. In 2001, he was liked to Professor at Department of Endoscopy, the Jikei University School of Medicine, Tokyo, Japan.