Prof. Chia-Tze Kao, international member of AAO and active member of WFO. Now, he is chairman of orthodontic department of Chung Shan Medical university hospital (1995-till now). He was Dean of college of oral medicine, Chung Shan Medical University since 2012-2016. He was the president of Taiwan Association of Orthodontists (TAO, 2007-2008) and as a chairman of Taiwan Board Orthodontist (TBO) of Taiwan Health Department. He was also act as a president of Asian Implant Orthodontic Conference (AIOC, 2007) that held in Taiwan. Now he is an advisor of Word Implant Orthodontic Committee (WIOC) too.