Masaki Hamamoto graduated from Hiroshima University School of Medicine in 1995. He received PhD degree at Hiroshima University School of Medicine in 2005. He had received medical training as a cardiovascular surgeon from National Cardiovascular Center and Hiroshima University Hospital. He became the chief surgeon of the Department of Cardiovascular Surgery at JA Onomichi General Hospital, Japan. He is currently Chief Director of the Department of Cardiovascular Surgery, JA Hiroshima General Hospital. I am a Board Certified Cardiovascular Surgeon by conjointly organized three societies (The Japanese Association for Thoracic Surgery, The Japanese Society for Cardiovascular Surgery, and The Japanese Society for Vascular Surgery).