JONATHAN LEHR is a software developer, architect, speaker, and author, whose works include Jakarta Commons Live (SourceBeat) and Jakarta Pitfalls (Wiley).

BILL WILLIS has over twelve years’ experience in the software industry. Bill is currently an enterprise architect and mentor at Object Systems Group. He is also the director of PatternsCentral.com, a community portal devoted to software patterns.

LeROY MATTINGLY is currently with Tecton Software, Inc. He has over ten years’ experience building large scale object-oriented systems. He also created The Integrator–a tool for authoring and managing the use case process while at OSGTools, a subsidiary of Object Systems Group.