Jonathan Stern used more than 13 years of experience in contributing to the original edition of this book. His background included senior positions in consulting, systems architecture, and technical sales at Oracle and other companies. He demonstrated in-depth knowledge of the Oracle Database across major open systems hardware and operating systems. His expertise included Database tuning, scaling, parallelism, clustering, and high availability for transaction processing systems and data warehousing implementations. Some of the fundamentals of Oracle that he originally contributed to the first edition live on in this edition of Oracle Essentials though much has changed in the Oracle Database since Jonathan passed on. Each edition of this book is a reminder of the talent and attention to detail that he possessed.