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- 2015 – present: Professor Emeritus Dept. of Orthodontics, College of Dentistry, Yonsei University Seoul, Korea.
- 1981 – 2015: Professor, Dept. of Orthodontics, College of Dentistry, Yonsei University
- 2009 – 2012: President, World Implant Orthodontic Association
- 2004 – 2008: Dean, College of Dentistry, Yonsei University
- 2000 – 2002: President, Korean Association of Orthodontists
- 1998 – 1999: Visiting Professor, Dept. of Orthodontics University of British Columbia, Vancouver
- 1984 – 1985: Visiting Assistant Professor, Dept. of Orthodontics University of Connecticut
