2013 - Present             Professor

Dept. of Agricultural Biotechnology

Seoul National University

2008 - 2013                Associate Professor

Dept. of Agricultural Biotechnology

Seoul National University

2009 - 2010                Visiting Professor

Dept. Molecular Cell and Developmental Biology

University of California, Los Angeles

2003 - 2008                Assistant Professor

Dept. of Agricultural Biotechnology

Seoul National University

2001 - 2003                Full-time Instructor

Dept. of Agricultural Biotechnology

Seoul National University

2000 - 2001                Post-Doctoral Research Associate

Department of Veterinary Anatomy & Public Health

Texas A&M University, College Station, Texas.

Research Projects : Development of porcine ES cells, Porcine nuclear transfer, Design and making DNA construct for gene targeting, Gene targeting in porcine and bovine embryonic cells and somatic cells.

 1994 - 2000               Graduate Research Assistant

Department of Veterinary Anatomy & Public Health

Texas A&M University, College Station, Texas.