- Program Committee, The 8th East Asian School of Knots and Related Topics, January 9-12, 2012, KAIST, Daejeon, Korea.
- Program Committee, The 7th East Asian School of Knots and Related Topics, January 10-13, 2011, Hiroshima University, Higashi-Hiroshima, Japan.
- Program Committee, The 6th East Asian School of Knots and Related Topics, January 25-28, 2010, Chern Institute of Mathematics, Tianjin, China.
- Co-organizer, Special Session on Knot Theory and Related Topics, Joint meeting of the Korean Mathematical Society and the American Mathematical Society, December 16-20, 2009.
- Co-organizer, The 5th East Asian School of Knots and Related Topics, January 11-16, 2009.
- Organizer, 2008 POSTECH Summer School on Knots and Manifolds, July 22-25, 2008.
- Co-organizer, The 4th KAIST Geometric Topology Fair, February 9-11, 2006.
- Co-organizer, The 2nd KAIST Geometric Topology Fair, February 17-19, 2005.
- Local organizing committee, Asiacrypt 2004, December 5-9, 2004.
- Co-organizer, The 1st KAIST Geometric Topology Fair, August 24-26, 2004.
- Organizing committee, The First East Asian School of Knots, Links and Related Topics, February 16-20, 2004.