Prof. Keon Jae Lee received his Ph.D. degree from the University of Illinois, Urbana-Champaign, in 2006. During his Ph.D. course at UIUC, he was involved in the first co-invention of "High Performance Flexible Single Crystal Electronics", called microstructured silicon and GaN. From 2006 to 2008, he conducted a joint research project of Unisantis (Japan) and IME (Singapore) in the field of three dimensional surrounding gate nano-transistors (SGT) for the future logic technology. Since 2009, he has been an Assistant Professor in MSE at KAIST. His current research interests are flexible and bio-optical devices for health, self-powered energy, and electronic applications.