He received his Ph.D. in Chemical Engineering from the KAIST, Korea in 2002. He joined Bell Laboratories, USA as a postdoctoral researcher and worked at Samsung Advanced Institute of Technology as (2003-2008). He was an associate professor in Materials Science and Engineering at the Pohang University of Science and Technology (POSTECH), Korea until August 2016. His research focuses on printed flexible electronics based on organic, carbon, and organic-inorganic hybrid perovskite materials for displays, solar cells, and bio-inspired neuromorphic electronics.