Keehoon Hong received his Ph.D.degree in Electrical Engineering and Computer Science from Seoul National University, Seoul, Republic of Korea in 2014. Since 2015, he has worked at the Electronics and Tele-communications Research Institute(ETRI), Daejeon, Republic of Korea, where he is currently the Director of the Digital HolographyResearch Section. His research interests include auto-stereoscopic three-dimensional displays, digital holographic displays, and holographic optical elements