Research topic: Material production and energy transfer in ecosystems Nutrient cycling in ecosystems [1982.12] Passed the 18th Technical Secondary School Exam [1985.5] Passed the 1985 Government-funded International Student Selection Exam [1983.6~1987.7] Forestry officer of Gyeonggi-do government [2010.10~Present] Full member of Korea Academy of Science and Technology [2016.4~present] President, Korea Forestry Association [2017.1~Present] Editor-in-Chief of the Korean Society for Climate Change