Professor in Plant Breeding : Sejong University (2015 ~ present)

Senior Breeder : Breeding Research Institute, Dongbu Farm Hannong (2007 ~ 2014), Breeding of cucumbers & cucurbits rootstocks

Breeder : Breeding Station (Guangzhou, China), Monsanto Korea (2000 ~ 2007); Principal cucumber breeder of Asian area, Monsanto

Research Scientist : Central R&D Institute, Dong-Yang-Moolsan Co. (1996 ~1999), Development of virus resistant garlic varieties and micropropagation

Ph. D. in plant breeding : Seoul National University (1997)