Toshinori Usui serves as an Associate Distinguished Researcher and Security Principal at NTT, where he focuses on scientific security research. His expertise includes malware analysis and exploit development, driven by a continuous commitment to enhancing his cybersecurity skills.

He earned his Ph.D. degree in computer science from The University of Tokyo in 2021. Prior to his current role, Usui held positions as a Researcher at NTT and was associated with NTT Security Holdings.