Before joining the University of Tokyo, he was an associate professor of Center for Computational Sciences, University of Tsukuba, and he has been playing the role as the chief architect for HA-PACS/TCA system which is high-density GPU cluster employing proprietary inter-GPU communication over the compute node using FPGA. From 2016, he has been working as the system operation member of Oakforest-PACS under JCAHPC. He received the M.E. degree and the Ph.D. degree in computer science from Keio University.