John Vlissides is a member of the research staff at the IBM T. J. Watson Research Center in Hawthorne, New York. He has practiced object-oriented technology for more than a decade as a designer, implementer, researcher, lecturer, and consultant. In addition to co-authoring Design Patterns: Elements of Reusable Object-Oriented Software, he is co-editor of Pattern Languages of Program Design 2 (both from Addison-Wesley). He and the other Design Patterns co-authors were recipients of the 1998 Dr. Dobb's Journal Excellence in Programming Award. Learn more about John.