Tim Hahn is a Distinguished Engineer at IBM and has been with IBM for 17 years. He is the Chief Architect for Secure Systems and Networks within the IBM Software Group Tivoli organization. Ori Pomerantz has been securing computer networks, and teaching other people to do the same, since 1995. Since joining IBM in 2003 he has written classes on various Tivoli security products, including IBM Tivoli zSecure.