Itzik Ben-Gan, is a mentor and cofounder of SolidQ. A Microsoft Data Platform MVP since 1999, he has delivered T SQL querying, tuning, and programming training worldwide. His books include T-SQL Querying and Microsoft SQL Server 2012: High-Performance T-SQL Using Window Functions. He has written for SQL Server Pro, SolidQ Journal, and MSDN, and has spoken at SQLPASS, SQLBits, IT/Dev Connections, and SQLTeach. He is the author of two SolidQ T-SQL courses.