Itzik Ben-Gan is a T-SQL trainer, regularly teaching, lecturing and writing on the subject. He has delivered numerous training events around the world focused on T-SQL Querying, Query Tuning and Programming. He is the author of several books including T-SQL Fundamentals, T-SQL Querying and T-SQL Window Functions. Itzik has been a Microsoft Data Platform MVP (Most Valuable Professional) since 1999.