Yong-Jin Kim has been working for ETRI in Korea since 1983. He has a lot of experience of R&D on ATM and IP technologies. Since 1998 he has been involved in IPv6 R & D projects. He issued a /35 prefix sTLA on November 1999 from APNIC for the operation of IPv6 network and service deployments in Korea. He is the head of the KRv6 project, which is the first national IPv6 deployment project in Korea launched at February 2000 for the development of IPv4/IPv6 translator named 6talk, IPv6 applications, IPv4/IPv6 translation API (Bump-in-the-API), and IPv6 testbed. Now, he is also developing auto-configuration technologies based on IPv6. He also plays an active role as an international partner in 6WINIT project which was initiated at January 2001 by European Union. He founded on March 2000 the IPv6 Forum Korea, which is a consortium composed of 62 organizational members for the promotion of IPv6 in Korea. Now he is actively involved in IETF and a co-author for several IETF WG documents. He received his Master and Ph.D. from KAIST.