Director in the General Bureau of Atomic Energy (GBAE); involved in the Democratic People's Republic of Korea's nuclear programme; as Chief of the Scientific Guidance Bureau in the GBAE, served on the Science Committee inside the Joint Institute for Nuclear Research.
Direktor asutuses General Bureau of Atomic Energy (GBAE); tegeleb Korea Rahvademokraatliku Vabariigi tuumaprogrammiga; osales GBAE sisese teaduslike suuniste büroo juhina teaduskomitees tuumauuringute ühisinstituudis.