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.