Private Practice: Lee, Dal-Ho Dental Clinic, Seoul, Korea (1991 ~ 1996)

Clinical Instructor: Prosthodontics and Implantology, Boston Univ.School of Dental Medicine (2000 ~ 2001)

Private Practice: Boston Dental Clinic, Seoul, Korea (2002 ~ present)

 President of Clinical & Academic Institute of Boston Implantology in Seoul

(2008~2010)

Adjunct professor of Department Implantology at BU Dental Medicine (2004~2006)

Director, Academic Affairs in Korean Academy of Aesthetic Dentistry

Clinical Instructor and Assistant Professor of Ewha woman’s University

 Medical College.

Clinical Instructor and Assistant Professor of Hallym University Medical College.

Clinical Instructor of center of Implantology of Seoul Asan Medical Center.