Professor in the Department of Laboratory Medicine,
and Laboratory Physician at Kangdong Sacred Heart Hospital,
affiliated with Hallym Unieversity Medical Center (1984~present )
Senior Vice-Director at Hallym University Medical Center (2004-2009)
Visiting Professor at Minnesota University & Hahneman University (1989-1990)
President, Korean Society of Hematology (2006-2008)
President, Korean Society of Laboratory Hematology (2004-2006) &
Korean Genetics and Molecular Diagnostic Study Group (2006-2008)