Dr. Shunsaku Nagasawa is a Postdoctoral Researcher at the Space Sciences Laboratory, University of California, Berkeley. He earned his Ph.D. from the University of Tokyo in 2024. He participates in the solar sounding rocket experiment FOXSI, leading the development of Cadmium Telluride (CdTe) hard X-ray detectors and the associated data acquisition systems. Additionally, he works on the MeV gamma-ray satellite mission COSI and contributes to the development of Background and Transient Observer (BTO) detectors.