Dr. Tagaya is an Associate Professor of Surgery in Dokkyo Medical University Koshigaya Hospital. He is presently working as a leading laparoscopic and endoscopic surgeon, and has been accumulating an extremely vast experience with hepatobiliary and gastrointestinal operations, as well as adrenal and bariatric surgery. He also studied liver transplantation at Queensland Liver Transplant Service in Brisbane, Australia from April 1994 to March 1996. This technique is useful for performing laparoscopic liver resection and vascular reconstruction. He is a recipient of a Video Award by the European Association for Endoscopic Surgery in 2007 with regards to double-balloon endoscopy. He is now investigating the technique of fluorescence imaging using indocyanine green during laparoscopic procedures and image overlay surgery as a navigation surgery.