Jack W. Crenshaw is an aerospace and embedded systems engineer living in the Tampa Bay area of Florida. He has over 40 years of experience in the development of systems and software for both aerospace and industrial systems, and he did much of the early trajectory analysis work for Project Apollo. Since then, he has developed simulation, analysis, and real-time embedded systems for everything from the Space Shuttle manipulator arms to satellite tracking antennae to medical patient monitors. His specialty is the application of advanced methods of math and physics to practical use in working, real-world systems.