After graduation from dental college of Kyungpook National University in 1985 and received his PhD degree in 1995 with the thesis about ‘the periodontal regeneration’. In 1993, he started seminars for private dentists to teach clinical periodontics and implant dentistry. Until now, more than 1,500 dentists completed this course in Korea. From 2000 to 2001, he went to the department of periodontics, school of dentistry, UCLA as a visiting scholar. After he came back from UCLA, he opened the biggest dental hospital called “MIR dental hospital” in Korea with 70 operatories and more than 20 dentists and 120 employees at Daegu, Korea in 2002.

With great success of the first “MIR dental hospital”, many dentists wanted to join and share the know-how and brand name. So he made a dental hospital network named “MIR Network”. Now it has 22 branches and more than 1000 employees and doctors in South Korea in 2009.

Almost at the same time with the opening of MIR dental hospital, he began a company called “MegaGen” to produce dental implants. In a short period of development, MegaGen took the leading position in the field of dental implant in Korea.

He is an active member of Academy of Osseointegration (AO) and also an international member of American Academy of Periodontology (AAP).