Dan Pilone is a Software Architect with SFA, Inc., cofounder and president of Zizworks, Inc. and a terrible rock climber. He has designed and implemented systems for Hughes, ARINC, UPS, and the Naval Research Laboratory. When not writing for O'Reilly, he teaches Software Design and Software Engineering at The Catholic University in Washington DC. Originally writing in C and C++, he has moved into the blissful world of managed code with Java and C#. He has had several articles published by Intelligent Enterprise and Java Developer's Journal on software process, consulting in the software industry, and 3D graphics in Java.
Neil Pitman is Chief Technical Officer of Mahjong Mania, co-developer of LamMDA from Mindset Corporation, and formerly Vice President of Research and Development at Codagen Technologies. Neil has twenty years of experience in software development ranging from medical systems to Smalltalk development platforms, gaming software to code generation. When he does real work, it's in J2EE and XSLT as well as UML. Look for him at http://www.architecturerules.com.