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 trilogyStructured Development for Real-Time Systems; in 1988, the first books defining object-oriented analysis; and in 2002, Executable UML: A Foundation for Model-Driven Architecture. Mr. Mellor's most recent book, MDA Distilled: Principles of Model-Driven Architecture, was published in March 2004 and coauthored by Kendall Scott, Axel Uhl, and Dirk Weise. Mr. Mellor is founder of Project Technology, Inc. (www.projtech.com), a company specializing in Executable UML and MDA tools. He is a member of the IEEE Software Industrial Advisory Board, and he was guest editor for a special issue of IEEE Software on model-driven development in September 2003. Mr. Mellor can be reached at steve at projtech.com.