Helen J. Wang is a researcher in the Systems and Networking research group at Microsoft Research, Redmond, WA. She leads the Shield research project. Her research interests are in system/network security, networking, protocol architectures, mobile/wireless computing, and wide-area large scale distributed system design. She received her Ph.D. degree from the Computer Science department of U. C. Berkeley in December, 2001. Her Ph.D. thesis was on "Scalable, robust wide-area control architecture for integrated communications". Helen obtained her Bachelor of Science in Computer Science from U. T. Austin, and Master of Science in Computer Science from U. C. Berkeley.