Stefan Hepper is the responsible architect for the WebSphere Portal, Workplace Client and Server programming model and public APIs and was co-leading the Java Portlet Specification V 1.0 (JSR 168) and is now leading the V 2.0 (JSR 286). Stefan has delivered a number of lectures at international conferences, like JavaOne, published various papers, and was co-author of the book Pervasive Computing (Addison-Wesley 2001). Stefan received a Diploma of Computer Science from the University of Karlsruhe, Germany, and in 1998 he joined the IBM Boblingen Development Laboratory.