1986 : LL.B., Kyungsung University, Busan, Korea

1988 : LL.M., Dong-A University, Busan, Korea

1994 : J.D., Dong-A University, Busan, Korea

Sep. 2020 – present : Chairman of Supporters Association, Busan Briquette Bank

Jun. 2019 – Mar. 2022 : 37th President of the Korean Federation of Teachers’ Associations

Nov. 2016 – Oct. 2017 : Chairperson, Committee for the Development of Universities of Education for Elementary School Teachers, Ministry of Education

Jun. 2016 – Jun. 2019 : 36th President of the Korean Federation of Teachers’ Associations

Apr. 2013 – Apr. 2017 : 6th President of Busan National University of Education

Jan. 2008 – Feb. 2008 : Education sector advisor for the 17th Presidential Transition Committee

There Is No Future If Education Collapses (Woojin, 2019)

100 Years of Education in Korea, an Education Powerhouse (Woojin, 2022)