Previously, he was a Discovery Chemist at Bristol-Myers Squibb and Pfizer. He has authored or edited over 20 books and several of those were published by Wiley, including Drug Discovery: Practices, Processes, and Perspectives, Heterocyclic Chemistry in Drug Discovery, Name Reactions in Heterocyclic Chemistry, Name Reactions for Functional Group Transformations, Contemporary Drug Synthesis, The Art of Drug Synthesis, and Modern Drug Synthesis. Douglas S. Johnson is a Research Fellow and head of Chemical Biology in the Neuroscience Medicinal Chemistry group at Pfizer Worldwide Research and Development. He is a co-author on more than 75 publications and patents and is a co-author of the book Contemporary Drug Synthesis and is an editor of The Art of Drug Synthesis, and Modern Drug Synthesis (all published by Wiley).