Bill Jelen is the host of MrExcel.com and the author of 54 books about Microsoft Excel including Excel Gurus Gone Wild and Pivot Table Data Crunching. He has made over 80 guest appearances on TV’s The Lab with Leo / Call for Help with Leo Laporte and was voted guest of the year on the Computer America radio show. He writes the Excel column for Strategic Finance magazine. He has produced over 2,100 episodes of his daily video podcast Learn Excel from MrExcel.