From 1953 to 1957 – LL.B., College of Law, Seoul National University (Korea).
From 1957 to 1959 – LL.M., Law Department, Graduate School of Seoul National University (Korea). Thesis on the topic “A Study on the Legal Issues for the Commercial Letter of Credit”.
From 1980 to 1984 – J.S.D., Law Department, Graduate School of Kyung Hee University (Korea). Thesis on the topic “A Study on the Liability of the Air Carrier and its Legislative Problems.”
From 1981 to 1999 – Professor and Dean of the College of Law at the Soongsil University (Seoul, Korea).
From 1990 to 1991 – Visiting Scholar at the School of Law of University of California at Los Angeles (UCLA), Washington College of Law, The American University in USA and Institute of Air and Space Law, McGill University (Montreal, Canada).
Visiting Professor at the Law School of the Beijing Institute of Technology (China).
Visiting Professor at the College of Humanities and Social Science (China).
Visiting Professor at the Nanjing University of Aeronautics and Astronautics (China).
From 2001 to 2009 – Visiting Professor at the Korea Aerospace University (Korea).
From 2000 to 2013 – Visiting Professor at the Chuo Gakuin University (Abiko, Japan).
From November 2004 to 2010 – Honorary Professor at the Gujarat National Law University (Gandhinagar, India).
From 1980 to 1983 – Legal Adviser at the Advisory Council on Policy-Making of Prime Minister of the Republic of Korea.
From 1980 to 1985 – Legal Adviser at the Ministry of Transportation of the Republic of Korea.
From 1985 to 1989 – Legal Adviser at the Ministry of Justice of the of the Republic of Korea.
Member of Space Law Committee at the International Law Association (London, UK).
From 1980 to present – Commercial Arbitrator at the Korean Commercial Arbitration Board.
On December, 1994 he received a “National Gold Magnolia Medal of Merit for the Contribution on the Developments of Aviation Law and Industry” from President of the Republic of Korea.
From 1993 to 1999 – President of the Korean Association of Air and Space Law.
On October, 2016 he received an “Outstanding Contribution Award” based on the merit of the developments for the Space Law Institute of Beijing Institute of Technology (BIT) from the Vice President of BIT (Beijing, China).
Honorary President of the Korea Society of Air & Space Law and Policy (Seoul, Korea).