School Library Media Center; Dae-gu Il Middle School, Kyungun Middle School, Daegu Seobu High School and Daegu Dasa High School; Daegu City Office of Education (March 2003-February 2021)
Library; Korea Institute of Defence Analysis; Seoul (August 2001-February 2003)
Library; Kyungpook National University (May 2001, May-July 2000, June-July 1999)
․ Committee member for selection 'Teachers' recommend book list' (2012-2017) Daegu City Office of Education, Daegu Public Library
․ The 4th Policy Development Task Force Team. (May 2013-February 2014) Daegu City Office of Education
․ Committee member for selection 'One city one book' (2010, 2011) Daegu City Office of Education
․ Test organizer in Civil Service Recruitment Exam. (August 2007) Jeonlabukdo Office of Education