Scott Ambler is an industry-recognized software process improvement (SPI) expert. He is the practice leader of the Agile Modeling (AM), Agile Data (AD), Agile Unified Process (AUP), and Enterprise Unified Process (EUP) methodologies. Scott is the (co-)author of several books, including Refactoring Databases (Prentice Hall), Agile Modeling (John Wiley & Sons), Agile Database Techniques (John Wiley & Sons), The Object Primer 3rd Edition (Cambridge University Press) and The Enterprise Unified Process (Prentice Hall). Scott is also a contributing editor with Dr. Dobb's Journal. In his free time, Scott enjoys landscape and wildlife photography and studies Goju-Ryu Karate. Due to his extensive travel to work with clients around the world, and his martial arts background, several people have accused him of being a spy for the Canadian government. Unfortunately, none of those people are now available for comment.

Stephen J. Mellor is an internationally recognized pioneer in creating effective, engineering approaches to software development. In 1985, he published the widely read Ward-Mellor trilogy Structured Development for Real-Time Systems, and in 1988, the first books defining object-oriented analysis. Stephen also wrote Executable UML: A Foundation for Model-Driven Architecture (Addison-Wesley, 2002). His latest book MDA Distilled: Principles of Model-Driven Architecture (Addison-Wesley) was published in 2004. He is active in the Object Management Group, chairing the consortium that added executable actions to the UML, and he is now active in specifying MDA. He is a signatory to the Agile Manifesto, and co-founded a company focused on tools to execute and translate UML models. He is now chief scientist of the Embedded Systems Division at Mentor Graphics. In his copious spare time, he chairs the IEEE Software Industrial Advisory Board.

Granville Miller is an expert on agile software development process design and an architect on the Microsoft Solutions Framework. He is the coauthor of Advanced Use Case Modeling (Addison-Wesley, 2000) and A Practical Guide to Extreme Programming (Prentice Hall, 2002). He brings 18 years of software development experience in the delivery of software applications. He has been actively promoting modeling, software development technology and software process for over a decade in various public forums.

Bran Selic is an IBM Distinguished Engineer at IBM Rational and an adjunct professor at Carleton University in Ottawa, Canada. He has over 30 years of experience in designing and implementing large-scale industrial software systems. Bran pioneered the application of model-driven development methods in real-time applications. He is chair of the OMG team responsible for the UML 2.0 standard.

Rebecca Wirfs-Brock, president of Wirfs-Brock Associates, is a world-renowned innovator in practical object analysis and design techniques. She is lead author of Object Design: Roles, Responsibilities and Collaborations (Addison-Wesley 2003), and she invented the set of development practices known as Responsibility-Driven Design. Most recently, she has focused on ways to effectively communicate design ideas, ways to be a thoughtful agile designer, designing flexible software without over- or under-engineering a solution, and effective ways to consider design alternatives. Among her widely used innovations are use-case conversations and object role stereotypes. She's a proponent of practical techniques and effective communication. She specializes in the transfer of object analysis and design expertise through mentoring, consulting and training.