Professor Jun is a professor at the Korea National Diplomatic Academy. Previously, he was a policy advisor to the Minister of Unification, visiting scholar at Keio University, secretary to the president for international affairs at the Presidential Office, and a professional staffer at Asia Foundation Center for US-Korea Policy. His research areas include the North Korean nuclear issue, inter-Korean relations, non-proliferation, nuclear security, and nuclear energy policies. He received his B.A. and M.A. from Seoul National University and his Ph.D. in political science from the University of Oregon.