Derek Walker, PhD, has distilled the experience of over forty years' work, with publications or patents in every one of the last six decades, into this book. After brief periods with the United Kingdom Atomic Weapons and Research Establishment and Dominion Tar and Chemical Company in Canada, he commenced his career in the development of chemical processes in the pharmaceutical industry through employment with Arapahoe Chemicals/Syntex, Glaxo Laboratories, Bristol-Myers, and finally Schering-Plough Research Institute, where he was vice president of chemical process development for fourteen years.