2013-Present,
Head professor, Psychiatry, Konkuk University School of Medicine
2012-2019,
Chief, Department of Psychiatry, Konkuk University Medical Center
2007-Present,
Director, Dementia Support Center, Seongbuk-gu
1998-Present,
Specialist, Department of Psychiatry
2012-2016,
Director, Cogclinic
2003-2004,
Training, Center for Aging and Mental Health Science, University College London(UCL)