Dr. Hiroshi Saito received his Master's degree from the Department of Mathematical Engineering & Information Physics at the University of Tokyo, in 1983 and joined the Core Switching Research Department of Nippon Telegraph and Telephone Public Corporation (now Nippon Telegraph and Telephone Corporation, NTT) in April of the same year. He received his Ph.D. from the same university in 1992, became a distinguished researcher at NTT Communications Network Laboratories in 1994, a senior distinguished researcher at NTT Service Systems Integration Laboratories in 2010, a professor in the Graduate School of Information Science and Technology at the University of Tokyo in 2018, a specially appointed professor at Jissen Women's University from April 2023, and a professor emeritus in the Graduate School of Information Science and Technology at the University of Tokyo to the present.

Since joining Nippon Telegraph and Telephone Public Corporation, he has consistently engaged in research and development in the field of information and telecommunications. He has made many outstanding achievements in traffic technology, bringing innovation to information and telecommunications services by creating and promoting pioneering theories and methods.

His most notable achievement is research and development into traffic technology for ATM networks, where he was the first in the world to propose a new direction for traffic research in response to the diversification of traffic. He was one of the first to advocate a new method, the nonparametric approach (a method that does not use parameterized models), in the research and development of broadband networks, which are adding various applications that cannot be handled by conventional theoretical models that assume the randomness of telephone traffic, and this has led to a new stream of research. The theoretical models he proposed and constructed in his research have always been related to real systems. He has applied his theories based on applied mathematics to the design, control, and management of real systems and the overall design, control, and management of communication networks, putting his research and applications in traffic technology into practice.

Furthermore, whereas existing traffic theory has been extended to apply stochastic process theory on the time axis to individual systems, he has clarified the relationships of network spatial structure and performance, including for social networks. He has also led the field of network science theory and spatial information mathematical applications to gain knowledge about the design, control, and information aggregation of networks.

For the above achievements, he received the 1994 System Science Encouragement Award at the Telecommunications Advancement Foundation Award, the 1998 Bibliography Award from the OR Society of Japan, the 2003 DICOMO 2003 Noguchi Award from IPSJ, the 2008 Outstanding Contributions Award from the IEICE Communications Society, the 2009 Telecom System Science Award of Telecommunications Advancement Foundation Award, the 2016 ACM MSWiM Conference Best Paper Award, and the 2020 Arne Jensen Lifetime Achievement Award, etc. These achievements have been recognized as significant contributions to the mobile communications-related industry and academia. Within IEICE, he served as the Chair of the Technical Committee on Information Networks in 2006, Councilor in 2008, and Director of Editorial and Publishing Affairs in 2011, and was awarded the title of Fellow in 2006 and the Achievement Award in 2023. He also received the titles of Fellow from the OR Society of Japan in 2003, and IEEE Fellow in 2005, and his activities have been recognized in various fields.

As described above, he has produced many world-class research results through theoretical research and practical applications, and his achievements in telecommunications have been remarkable. We are confident that he is worthy of being the IEICE's Honorary Member, and we recommend him for this position.