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Derek J. Hatley previously was president of System Strategies, an international consulting and training firm based in Jenison, Michigan. Prior to founding System Strategies, he was a Staff Engineer at Smiths Industries, Avionic Systems Division, where he was responsible for systems and software development techniques. He developed the requirements model, managed its first major application, developed an instructional workshop to be given internally and to customers and suppliers, and has presented technical papers at numerous international professional conferences. An avid music lover for most of his life, he now spends part of his time writing and arranging music.
Imtiaz A. Pirbhai was a principal of Systems Methods in Seattle, Washington, specializing in real-time and general systems development training. He previously was responsible for the development of structured methods standards and procedures at the Boeing Commercial Airplane Co. He taught and consulted internationally, introducing the methods described in Strategies for Real-Time System Specification throughout the world. At the time of his death in August of 1992, he had begun work on Process for System Architecture and Requirements Engineering (Dorset House, 2000), coauthored with Derek Hatley and Peter Hruschka.