Dr. Okonogi is a Chief Physician of QST Hospital/Department of Charged Particle Therapy Research, National Institutes for Quantum Science and Technology, Japan. He received his MD and PhD degrees from Gunma University Graduate School of Medicine. As a board-certified radiation oncologist in Japan, Dr. Okonogi has experience in proton beam therapy, brachytherapy, and carbon-ion radiotherapy. His current research focuses on the development in combination of immunotherapy and carbon-ion radiotherapy and Hypo-fractionated carbon-ion radiotherapy.