Sangjoon Park received his BSc and MSc in Electronics Engineering from the Kyung-Pook National University in 1988 and 1990, respectively. He received his Ph.D. from the Computer Science Department at North Carolina State University in 2006. He is currently the Director of the Positioning and Navigation Technology Research Section at the Electronics and Telecommunications Research Institute (ETRI), Korea. His current research interests are in positioning, wireless sensor networks, next-generation embedded sensor networks, multi-sensor data fusion, and target tracking. He has also worked as a senior researcher.