SCOTT MANN is a Linux software engineer at LeftHand Networks in Colorado. He has previously specialized in Linux and UNIX systems for both SGI and Sun Microsystems. His previous Prentice Hall PTR books include Linux TCP/IP Network Administration.
ELLEN L. MITCHELL is a security analyst at Texas A&M University, where she is responsible for campus network security, development, and administration. She currently maintains the Tiger UNIX security package.
MITCHELL KRELL, Ph.D., is a former university professor turned consultant. He currently travels around the country teaching classes and consulting for various government agencies on a variety of topics including Linux, IRIX, system administration, networking, web development, and computer security.