Chae Sub LEE has been working in the telecoms standardization field for over 27 years. He has been involved in ITU-T standards development for the ISDN, GII, IP-based networks, NGN and IPTV. He served ITU-T activity as a Vice-chairman of SG13 from 2001 till 2008.
He shared his role as a Vice-Chairman of ITU-T IPTV Focus Group since July 2006 and as a Chairman of NGN Focus Group from June 2004 till November 2005.
He continues to serve as Chairman of ITU-T SG 13 which is a lead group of standard development on Future Networks and Cloud Computing including NGN and mobilility management since 2009 including this study period 2013 ~ 2016.