John Phelps is a research vice president in Gartner Research, where his research has focused on the evolving role of large systems and the traditional data center for the past 15 years. This includes research into areas where high-end Unix and Windows attempt to provide traditional mainframe functionality. He has been leading the research on server consolidation, is part of the server virtualization team covering non-x86 virtualization, and works in the area of "greening" the data center.