Mitsunori joined Nissan Motor Corporation in 1990, where in the Aerospace Division (present IHI AEROSPACE) he worked on the development of the Logistics Module for the International Space Station. Following his experience in basic research work while seconded to JAXA, including development of highly reliable components for space use and radiation evaluation research, he then engaged in the development of defense equipment, design of rocket onboard electronics, and development of thrust control devices for various rockets.