He received the B.S. in computer engineering from Chonbuk National University in 2001, the M.S. degree in computer science from KAIST in 2003, and the Ph.D. degree in computer science from UCLA in 2008. He continued his studies at UCLA as a post-doctoral research scientist (2008-2009) and then worked for Alcatel-Lucent Bell Labs as a member of technical staff till 2010. His research interests include Human-Computer Interaction, Social Computing Systems and Mobile Pervasive Computing.