David Walker is a Senior Sitecore Architect for Layer One Media and a Sitecore 2015 Technology MVP. He has over 20 years' experience in application development with over 50% of that employed as a consultant. He has been an MCP since 2003, MCAD and MCSD since 2005, and was a Microsoft MVP - ASP/ASP.NET from July 2007 - July 2009. Prior to joining Microsoft, he was formerly a board member for INETA (Vice President, Speakers Bureau), President of the Tulsa Developers .NET users group, founder and President of the Tulsa SQL Server Group and Tulsa Java Developers Group, and Vice President of the Tulsa SharePoint Interest Group. He has been the Chairman of the region's largest and highly successful technical training event, now going on its seventh consecutive year, TulsaTechFest.com. Recently he has focused on a wide range of newer technologies, including: Azure, AppFabric, MEF (Managed Extensibility Framework), SharePoint, WindowsPhone and Windows8/WindowsStore applications. He has been using WCF (Windows Communication Foundation) and WPF (Windows Presentation Foundation) since the first Beta release back in 2005/2006!