Before he joined SKKU, he worked as a postdoctoral associate at Massachusetts Institute of Technology (MIT) and Stanford University. He received a B.S. degree in the School of Mechanical and Aerospace Engineering at Seoul National University (SNU) in 2004, a M.S. degree and Ph.D. degree in the Department of Mechanical Engineering at Stanford University in 2006 and 2010. His research focus lies in developing high-performance energy conversion and storage devices, including fuel cells, electrolysis cells, Li-ion batteries, and photovoltaic cells.