● Director of Vivaldi Research Institute
● Author of 12 published books
● A lecturer who gives more than 200 lectures a year
☆ Published Books
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Part 1, Part 2, Part 3
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☆ Lectures and Special Sessions
Samsung Electronics, LG Display, KB Kookmin Bank, S-Oil, Ministry of Economy and Finance at the Government Complex,
Daegu City Hall, Daegu Metropolitan Office of Education, Gyeongsangbuk-do Office of Education, Yangsan Office of Education, Busan Metropolitan Office of Education, Gimcheon City Hall, Bucheon Office of Education,
National Pension Service, National Library for Children and Young Adults, Kyungpook National University, Daejeon University, Dong-A University, and many other educational institutions