William H. Winsborough is a Research Associate Professor in the Center for Secure Information Systems at George Mason University. He received his PhD at the University of Wisconsin-Madison in 1989. Dr. Winsborough's current research interests are in computer security and privacy in distributed systems, with an emphasis on policy-based techniques. He is particularly interested in techniques for managing the sharing of resources across multiple organizations or the whole Internet while protecting them from misuse. Dr. Winsborough is Program Co-chair of the 2005 IEEE Workshop on Policy in Distributed Systems and Networks (Policy 2005). He is the author of 34 refereed research articles and papers, the most recent of them in the Journal of the ACM. His seminal article in Automated Trust Negotiation has been cited 34 times according to citeseer. Two patents have been awarded based on Dr. Winsborough's research, and he received a DARPA award for Excellence in Industrial Research in 2003.