Dong-Seok Sohn, DDS, PhD, is a professor and chairman in the Department of Oral and Maxillofacial Surgery, School of Medicine, Catholic University Medical Center of Daegu, Republic of Korea. He is the former president of the International Congress of Oral Implantologists (ICOI) Asia-Pacific Section, as well as the founding president of the World Academy of Ultrasonic Piezoelectric Bone Surgery.