Hyunsoo Yoon received his B.S. degree in electronics engineering from Seoul National University, Seoul, South Korea, in 1979, his M.S. degree in computer science from the Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea, in 1981, and his Ph.D. degree in computer and information science from The Ohio State University, Columbus, in 1988. He is currently a Professor of the Department of Computer Science, KAIST. From 1978 to 1980, he was with the Tongyang Broadcasting Company, South Korea, then Samsung Electronics Company, South Korea during 1980 – 1984. From 1988 to 1989, he was a Member of the Technical Staff with AT&T Bell Labs, Indial Hill, IL. Since 1989, he has been a Professor with the Department of Computer Science, KAIST. His research interests include mobile ad hoc networking, wireless sensor networking, next-generation mobile communication networks, and information security.