John Craddock has designed and implemented computing systems ranging from high-speed industrial controllers through to distributed IT systems with a focus on security and high-availability. John has been a key player in many IT projects for industry leaders including Microsoft, the UK Government and multi-nationals that require optimized IT systems. He developed technical training courses that have been published worldwide, co-authored a highly successful book on Microsoft Active Directory Internals, and presents regularly at major international conferences including, TechEd, ITForum and European summits. John is passionate about communicating tough technical content in an engaging and highly consumable format. He can be engaged as a consultant or booked for speaking engagements through XTSeminars. www.xtseminars.co.uk.