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Dr. Kazuo Koyanagi is Associate Professor of Department of Gastroenterological Surgery, Tokai University School of Medicine, Isehara, Japan. Dr. Koyanagi graduated from Keio University School of Medicine, Tokyo, in 1992. He has engaged in the profession of esophageal surgical oncology and thoracoscopic minimally invasive esophagectomy. He received the degree of PhD at Keio University in 2001. He has studied abroad as a research fellow at Cornel University and John Wayne Cancer Institute from 2002 to 2005. He is a Board Certified fellow of Japan Surgical Society, Japan Esophageal Society, so on.