This book is a collection of essays on service and advanced technology written by the author and are based on peer-reviewed papers presented at technical conferences. Service and advanced technology is the cornerstone of modern business and management, and future developments in the various disciplines will be based on concepts presented herein. The essays can be easily be read by persons in all areas of business and management. Some of the papers have been modified to better suit a general audience, and others have been simply improved. Titles and formatting have been adjusted in some cases. Some of the reasons for studying service and advanced technology are that the subjects serve as the bases of our everyday existence. We use service and technology on a daily basis, yet we know very little about the underlying concepts. We have no introduction, no principles of best behavior, and no theories. It is time for a change. The reader is expected to read the essays individually and in any appropriate order. Accordingly, some of the introductory material is repeated. This fact is just part of the notion of presenting topics on a needed basis. The table of contents has been designed to better serve the reader. An entry gives an abstract to the respective essay, and serves an aid to the reader in selecting an essay of interest. The abstract entries serve to give a quick outline of the subject matter. The essays give a view of several areas of interest to the modern reader and cover the following subjects: Service concepts, Service management, Service technology, Hospitality, Cybersecurity, Service economics, Ransomware, Applied cybersecurity, Cybersecurity policy, Watchlist concepts, Identity, The ontology of identity, Service systems ontology, and Terrorism. Harry Katzan is a professor, author, and consultant, and enjoys outdoor activities.