Hohyun Keum received the B.S. degree in mechanical engineering from the University of Illinois at Urbana-Champaign, Urbana, IL, USA, in 2010, where he has been pursuing the Ph.D. degree since 2011. His current research interests include developing transfer printing micro-fabrication technique, which includes heterogeneous assembly, design and fabrication of MEMS device, and 3-D micromanufacturing.