He received his PhD from MIT in 2003. His main research interests are in computer vision, geometric algorithms and artificial intelligence. His work has been supported by the National Science Foundation, including a CAREER award received in 2008. He is currently serving as a program chair for the 2011 IEEE CVPR. He is an Associate Editor of the IEEE Transactions on Pattern Analysis and Machine Intelligence and an Editorial Board Member for the International Journal of Computer Vision. In 2010 he received the IEEE CVPR Longuet-Higgins Prize for fundamental contributions to computer vision. He also received the PASCAL Visual Object Challenge "Lifetime Achievement" prize.