William J. deKryger is a retired Professor of Automotive Technology in the Department of Engineering and Technology at Central Michigan University in Mount Pleasant, Michigan. A certified ASE Master Technician for more than thirty-five years, Dr. deKryger has worked as a professional technician for automotive dealerships and independent garages, served as an expert witness for automotive cases, and been an automotive arbiter for the National Center for Dispute Settlement. His academic interests have taken him to Vladimir State University in Vladimir, Russia, as a study abroad leader, as well to Instituta Technologico Y de Superiores de Monterrey, Campus Toluca, Mexico, as a visiting professor. A member of the Society of Automotive Engineers, Dr. deKryger holds an Associate�s Degree in Automotive Services, a Bachelor of Science in Technical Education from Ferris State University, and a Master of Arts in Higher Education from Central Michigan University. John C. Peterson is a retired Professor of Mathematics at Chattanooga State Community College, Chattanooga, Tennessee, where he received the Teaching Excellence Award. His professional experience includes teaching at middle school, high school, and university levels, as well as work in industry. In addition to MATHEMATICS FOR MACHINE TECHNOLOGY, 8E, Dr. Peterson has authored or co-authored four other Cengage books: INTRODUCTORY TECHNICAL MATHEMATICS, TECHNICAL MATHEMATICS, TECHNICAL MATHEMATICS WITH CALCULUS, and MATH FOR THE AUTOMOTIVE TRADE. A member of the team that revised the 2015 College Board of Mathematical Sciences cross-sectional survey of undergraduate mathematical science programs, Dr. Peterson has also served as a vice president of The American Mathematical Association of Two-Year Colleges. He has published more than 90 journal papers and given more than 200 presentations. Dr. Peterson earned his Ph.D. in mathematics education from The Ohio State University.