Biographical Sketch: Over 20 years in IT industry as both a customer and consultant. 15 years specializing in mainframe performance at a large international bank and 6 years in enterprise I/O performance with IntelliMagic. As a customer, John designed, implemented and maintained many critical projects such as WLM Goal Mode and GDPS/Data Mirroring. He has extensive experience with many performance analysis tools and techniques at the hardware, OS, and application levels. As a consultant, John has assisted many of the world's largest datacenters with their z/OS performance challenges and held Subject Area Chair positions with CMG for both Storage and Capacity Planning for several years. John has hosted many sessions at CMG, SHARE, etc. as well as several regional user groups. In 2013, John joined MVS Solutions as their Principal z Performance specialist.