He was a visiting professor at the University of Southern California (2004-2005) and at Stanford University (2012-2013). He is a deputy editor of the Korean Journal of Orthodontics (KJO). His research focuses on orthodontic treatment with CAD/CAM technology. His recent paper described a virtual model, and it was published in the 4th issue, 2014, of Am J Orthod Dentofacial Orthop as a cover issue.