ACTIVITY, POSITION and MEMBERSHIPS:
1991. 3. 13 - present Member of The Korean Medical Association
1996. 4. 12 - present Member of The Korean Neurosurgical Society
1999. 5. - present Member of The Korean Spinal Neurosurgery Society
2004. 8. 31 - present Member of The American Association of Neurological Surgeons (AANS)
2005. 5. - present Member of The Korean Minimally Invasive Spine Surgery Society (KOMISS)
2006. 5. 1 - present International Member of the Congress of Neurological Surgeons (CNS)
2008. 7. 3 - present Member of The Korean Cervical Spine Research Society
2011. 7. 10 - present Member of The North American Spine Society (NASS)
2011. 10. - 2013. 5. Editor-in-Chief, Korean Journal of Spine, the Official Journal of the Korean Spinal Neurosurgery Society
2012. 4. 16 - present Member of The Korean American Spine Society (KASS)
2014. 1. - present Member of The International Editorial Board, The Journal of Spinal Surgery, the Official Journal of Neuro Spinal Surgeons Association (NSSA), India
2015. 9. 1 - present Member of The Spine Committee of the World Federation of Neurosurgical Societies (WFNS)
2017. 9. 29 - present Honorary Life Membership of the Neuro Spinal Surgeons Association (NSSA), India