James Turnbull is an experienced technology and business leader with a focus on building
organizations, infrastructure, applications and security. He's the author of six technical books
including Hardening Linux, which focuses on
hardening Linux hosts including the base operating system, file systems, firewalling, connections,
logging, testing your security and securing a number of common applications including e-mail, FTP
and DNS. He is also the author of Pro Nagios 2.0, which focuses on enterprise management using the
Nagios open source tool.