Bill Jelen is an Excel expert at www.mrexcel.com, a regular on TechTV Canada’s Call for Help, and a video podcaster who is regularly listed in the iTunes top 50. He is the author of Excel Gurus Gone Wild, Pivot Table Data Crunching, Slaying Excel Dragons, and 14 titles in the Excel for Professionals series. He has been named a Microsoft MVP for seven years and is a contributor to CFO Magazine and Strategic Finance Magazine. He lives in Akron, Ohio.