Professor Takashi Toyonaga graduated from Ehime University School of Medicine in 1989. He joined Kishiwada Tokushukai Hospital,Osaka, Japan. In 2007, He was promoted as a Director, Associate Professor of Department of Endoscopy, Kobe University Hospital. He published many scientific papers regarding ESD. He also worked energetically to spread ESD all over the world and challenge to the limits of therapeutic endoscopy. In 2024, He was appointed to a Professor of Division of Gastroenterology, Kobe University Graduate School of Medicine.