Dr. Kee-Joon Lee is a professor at the Department of Orthodontics at Yonsei University College of Dentistry, Seoul, Korea. He is the current president of the World Implant Orthodontic Association. He received a DDS and PhD degree at the Graduate School, College of Dentistry, Yonsei University. He completed orthodontics specialty training at Yonsei University Dental Hospital. He was a visiting scholar at the Department of Biochemistry, University of Pennsylvania School of Dental Medicine in 2002-2004 and at the Division of Plastic Surgery, the Children’s Hospital of Philadelphia in 2010-2011. He was an adjunct professor at the Department of Orthodontics, University of Pennsylvania, between 2016 and 2019 and Temple University between 2010 and 2011. He has contributed many book chapters on the biomechanics of miniscrew-driven orthodontics, non-extraction treatment in adults, up-to-date lingual orthodontic mechanics, and surgery-first approaches using TADs. He is the first to demonstrate the miniscrew-assisted rapid palatal expander (MARPE) for adults in AJO-DO, which was cited by many other authors. He has published many articles and case reports regarding the treatment of non-eruption and total arch movement for hyperdivergent faces in orthodontic journals, including two cover issues in AJO-DO. His fields of research include clinical biomechanics regarding the application of TADs and the sutures and bones' responses to orthodontic stimuli. He has been a reviewer in major orthodontic journals, including AJO-DO, Angle Orthodontists, and the European Journal of Orthodontics. He has been invited to many international orthodontic conferences around the world.