He joined the Nippon Telegraph and Telephone Corporation (NTT), Tokyo, Japan in April 1989, where he was engaged in research and development of ATM traffic control and ATM switching system architecture design. From August 1996 to September 1997, he was engaged in research on high-speed networking as Visiting Scholar at Washington University in St. Louis, MO, USA. From September 1997 to June 2001, he was directing architecture design for high-speed IP/MPLS label switching router research project at NTT Network Service Systems Laboratories, Tokyo, Japan. From July 2001 to March 2004, he was engaged in the research fields of photonic IP router design, routing algorithm, and GMPLS routing and signaling standardization at NTT Network Innovation Laboratories. Since April 2004, he has been engaged in the research fields of photonic IP router design, routing algorithm, and GMPLS routing and signaling standardization at NTT Network Service Systems Laboratories. Since April 2006, he has been leading the IP Optical Networking Research Group in NTT Network Service Systems Laboratories. He is active in standardization of GMPLS in the IETF.
He received the B.E., M.E., and Ph.D degrees in information and computer sciences from Osaka University, Osaka in 1987 1989, and 1998, respectively.
He is a member of IEICE, IEEE, and ACM. He was a Secretary of International Relations of the Communications Society of IEICE from June 2003 to May 2005. He was the Vice Chair of Information Services of IEEE ComSoc Asia Pacific Board from January 2004 to December 2005. He was engaged in organization of several international conferences including HPSR 2002, WTC 2002, HPSR 2004, WTC 2004, MPLS 2004, iPOP 2005, MPLS 2005, WTC2006, iPOP 2006, and MPLS 2006. He received the Young Engineer Award from the IEICE in 1995. He received the Switching System Research Award from the IEICE in 1995 and 2000.
He co-authored "GMPLS Technologies: Broadband Backbone Networks and Systems (Optical Engineering)" Marcel Dekker Inc.