•MD Yonsei University College of Medicine 1978
•Residency at Severance Hospital 1978-1983
•Professor of Medicine at Yonsei University College of Medicine 1986-2016
•Research Associate, Division of Rheumatology, University of Alabama at Birmingham, USA 1989-1992
•Chair of the Board of the Korean College of Rheumatology 2008-2010
•Dean of the Cha Medicam Univerity School of Medicine 2016-2020