Rob Farley runs LobsterPot Solutions. He is an MCM, MVP, MCT, PDW Trainer, and proud Arsenal supporter. He spends a lot of his time either tuning queries or helping people with their BI systems, from small in-house data warehouses to large PDW implementations. His presentation style and his ability to explain complex concepts simply are known throughout the SQL Server community. He blogs at http://sqlblog.com/blogs/rob_farley and at http://sqlperformance.com/author/robfarley , and is on Twitter at @rob_farley.