Donald W. Benbow has conducted industrial statistics courses for companies for over three decades. In addition, he taught mathematics, statistics, freshman engineering, quality assurance, and computer science course at Marshalltown Community College. He has a BS degree in mathematics from Iowa State University and a MS degree in mathematics from Michigan State University. He is co-author of The Certified Quality Technician Handbook, The Certified Six Sigma Black Belt Handbook, and Introduction to 8D Problem Solving. He is ASQ credentialed as a CQA, CQT, CQE, and CRE.