Before joining the Division of Information Studies at the Wee Kim Wee School of Communication and Information, Dr Na worked six and half years for a Korean military research institute, the Agency for Defense Development, as a senior researcher. At Texas A&M University, he developed a caT (context-aware Trellis), a context-aware hypertext model with associated tools, for his dissertation. Currently, he is exploring effective ways of performing information processing by applying various techniques from multidiscipline, such as machine learning, data mining, information retrieval, human-compuer interaction, and natural language processing. He has published over 40 papers in various international journals and conference proceedings mainly in the areas of Digital Libraries, Hypertext & Hypermedia, Document Engineering, and Knowledge Organization.