Kimitaka Kaga, MD, PhD. is the emeritus professor of University of Tokyo and the emeritus director of National Institute of Sensory Organs in National Hospital Organization Tokyo Medical Center. He graduated from the School of Medicine in the University of Tokyo. His academic specialty is otology, neurotology and audiology. His surgical specialty is otological surgery including cochlear implant, cosmetic and functional reconstruction for microtia and atresia, and tympanoplasty. His academic concern is central auditory processing, auditory plasticity and vestibular failure and compensation in children. He is the president of Tokyo Branch of the ORL Society of Japan Inc., and the former president of Otological Society of Japan. Now he works in two institutes of The National Institute of Sensory Organs and Kamio Memorial Hospital, Audiology Clinic in Tokyo.