Masaki Nio, M.D., Ph.D., ACSFMasaki Nio is Professor and Chief of Pediatric Surgery at Tohoku University Graduate School of Medicine and Director of Pediatric Medical Center of Tohoku University Hospital. In 1981, he completed a M.D. course at Tohoku University School of Medicine. In 1983, he joined the Second Department of Surgery, Tohoku University Hospital, which Professor Morio Kasai presided over from 1963 to 1986. In 1987, he completed a Ph.D. course in Pediatric Surgery at Tohoku University Graduate School of Medicine. From 1991 to 1993, he worked as a research fellow in Children’s Hospital of Los Angeles, USA. He served as the President of Japanese Society of Pediatric Surgeons, a Board Member of Japan Surgical Society, a Board Member of Pacific Association of Pediatric Surgeons, the Chairman of Japanese Biliary Atresia Society, and so on. He has been a secretary general of Japanese Biliary Atresia Society since 2008.