John R. Vacca is an information technology consultant and internationally known, best-selling author based in Pomeroy, Ohio. Since 1982, John has authored 42 books and more than 550 articles. John has a rich background in technology and science as a former configuration management specialist, computer specialist, and the computer security official (CSO) for NASA's space station program (Freedom) and the international space station program, from 1988 until his early retirement from NASA in 1995. John was also one of the security consultants for the MGM movie AntiTrust, which was released on January 12, 2001. In addition to his many writing projects, John is a freelance editorial reviewer for online retailers.