Biographical Sketch: Bill Bitner is a Senior Software Engineer in the IBM Systems & Technology Group, Endicott NY where he leads the z/VM Performance Evaluation team. He joined IBM and the VM Performance group in 1985 after receiving a B.S. in computer science from the University of Pittsburgh at Johnstown. Bill splits his duties between design of future product, educating customers and other IBMers, and working customer situations (both pre-sales and post-sales). In 1997, he became a companion of the Order of the Knights of VM. He has been involved in over 20 releases of the VM product; he has spoken at over 100 conferences and user groups; and he has worked with 100s of customers. Bill's first involvement with SHARE was in 1990. He was soon hooked on the insight he gained from working with SHARE attendees.