Michael Alexander is a Microsoft MVP who has written several books on advanced business analysis with Access and Excel, including 101 Ready-To-Use Excel Macros and the Access 2013 Bible. A consultant and developer, he offers workshops and webinars through www.datapigtechnologies.com. John Walkenbach, aka Mr. Spreadsheet, has written hundreds of articles and over 50 books, including multiple editions of the bestselling Excel Bible . He also created the award-winning Power Utility Pak.