Bill Jelen, known worldwide as MrExcel, presents live Excel seminars to accountants throughout the U.S. His 20 books on Microsoft Excel include Special Edition Using Excel 2007, Pivot Table Data Crunching, and VBA and Macros for Microsoft Excel. Honored as a Microsoft MVP for Excel, he has produced 500 episodes of his "Learn Excel from MrExcel" video podcast. Michael Alexander, is a Microsoft Certified Application Developer (MCAD), Senior Program Manager for a top Texas technology firm, and principal of DataPigTechnologies, a developer of Excel tutorials. He is author of several books on data analysis with Access and Excel.