YOO, JoonKoo is a Research Professor of the Center for International Law, KNDA(Korea National Diplomat Academy), Ministry of Foreign Affairs and concurrently serves as the visiting professor of the GSIS of Yonsei University. He has been a member of the advisory committee of the Ministry of Defense/Ministry of Science, Information & Technology/Ministry of Trade, Industry & Energy/Defense Acquisition Program Agency. He currently specializes in international public domain laws focusing on cyberspace & outer space, and has served as a chief legal adviser for the 5th UNGGE(2016-17). Professor Yoo served as Deputy Director of the Presidential Committee for the G20 Seoul Summit(2010-11). Before teaching, Dr. Yoo was a legal adviser specializing in International Trade and Defense Acquisition with Aitken, Berlin & Brooman in Washington D.C.