Ichiro Kaji is a Project Researcher, Research Center for Advanced Science and Technology, the University of Tokyo. His research focuses on the provisions of the Japan-US Security Treaty, especially Article X which defines the duration of the treaty. He is currently building an online database of historical records of Japan-US relations on ROLES website. He obtained his Ph.D. in Law and Politics from Osaka University in 2021. He was a Specially Appointed Fellow at Center for the Study of Co*Design, Osaka University(2018-2021).