John Nicholas Zorich has a Bachelor’s and a Master’s degree in botany from the University of California. He has worked in the biotechnology industry since 1979, in QA/QC, Mfg. and R&D. For the past 25 years, he has worked as a statistical consultant to that industry. His consulting clients have included several large multi-national biotechnology companies as well as many Silicon Valley startups. He designs statistical application software programs that have been purchased by more than 140 companies, world-wide. For almost 20 years, he has been the in-house subject-matter expert in statistics for one of the EU medical-device Notified Bodies. For 20 years, he's been an instructor in applied industrial statistics for the Biotechnology Center of Ohlone College and is an annual guest lecturer in applied statistics in the Graduate Department of Biomedical Engineering at San Jose State University. In recent years, he's published three papers on aspects of teaching statistics, and published one paper on how to extend the shelf-life of pharmaceuticals simply by improving the statistical method of calculation. The research for this book on correlation has been an ongoing passion of his for the past 30 years. He lives in Houston, Texas, with his wife Sylvia. When not involved in statistical pursuits, he enjoys gardening, reading, and traveling.