Prof. Shinji SUMIMOTO Shinji Sumimoto is a project professor at the University of Tokyo's Supercomputing Research Division in 2022 after 36 years in industry. He developed PMv2 for SCore in the RWCP project (1997-2001), then moved to Fujitsu Laboratories, where he commercialized PC clusters such as the PC Riken Super Combined Cluster and the University of Tsukuba PACS-CS Cluster (2001-2006), and contributed to the K project to develop interconnects and system architectures. At Fujitsu, he led the development of Fujitsu MPI and FEFS (2007-2011), and led Arm HPC open source software activities as a senior architect for the successor to Fugaku (2012-2022). His research focuses on HPC system software and high-performance communications, covering processor architecture, communications hardware, Linux kernel, and MPI communications libraries. He has been involved in MPI standardization (3.0-4.1) since 2009. Sumimoto is participating in the heterogeneous computing "h3-Open-BDEC" project (2019-2023) and the JHPC-quantum project (2023-2028), and is developing h3-Open-SYS/WaitIO and its Router variant. Sumimoto received his Bachelor of Engineering from Doshisha University (1986) and his PhD in Engineering from Keio University (2000, PhD thesis).