His research is in the areas of Data Mining, Knowledge Discovery in Databases, Databases, Sensor Networks, Peer-to-Peer systems, and Algorithms. He has developed clustering, classification and indexing techniques for high-dimensional and object trajectory data, data analysis tools for sensor networks, and is currently working on blog and document analysis problems. He has co-authored over a hundred journal and conference papers that have been widely cited and a book. He has supervised 8 Ph.D. Theses and 18 MS theses. His past students currently hold academic positions or are employed in top industry labs.