He received his B.S. degree in EE from Seoul National University, Korea in 1999, and M.S. and Ph.D. degrees in Electrical Engineering: Systems from the University of Michigan in 2005 and 2010. His research interests lie in wireless networking with an emphasis on cognitive radios (CR), mobile cloud, WLAN and LTE, and 5G communications. He is a senior member of the IEEE, and an editor of Journal of Communications and Networks (JCN).