He studied Computer Science and Mathematics as an undergraduate at Cornell University where he received his B.A. in 1994. He received his Ph.D. degree in Computer Science from University of California at Berkeley in 1998.��From 1999 to 2002, he was a research faculty at Robotics Institute at Carnegie Mellon University.� His current research interests focus on image segmentation and recognition, human activity recognition in video. His other research interests include image/video retrieval, and vision based desktop computing.