About the Author: John Ewart is a systems architect, software developer, and lecturer. He has taught courses at a variety of institutions including the University of California, California State University, and local community colleges, covering a wide range of computer science topics including Java, data structures and algorithms, operating systems fundamentals, UNIX and Linux systems administration, and web application development. In addition to working and teaching, he maintains and contributes to a number of open source projects. John currently resides in Sonora, California with his wife, Mary, and their two children.