Professor Hirokazu Hirai is engaged in the development of foundational technologies for the treatment of rare brain-related diseases. He is currently involved in the "Project for Comprehensive Understanding of Brain Function Networks through Innovative Technologies" led by the Japan Agency for Medical Research and Development. Professor Hirai is responsible for "creating new technologies." One significant achievement of his previous research is the highly efficient expression of foreign genes in specific cell groups within the primate marmoset brain. The next aim is to develop a "carrier" for genes that can penetrate the barrier between the blood vessels and the brain (blood-brain barrier). Once this technology is completed, it is expected to accelerate significantly various basic and clinical research worldwide.