Michael Alexander is a Microsoft Certified Application Developer and author of several books on Microsoft Access and Excel. He runs a free tutorial site at datapigtechnologies.com. Dick Kusleika has been helping users get the most out of Microsoft Office products for more than fifteen years through online forums, blogging, books, and conferences. John Walkenbach is arguably the foremost authority on Excel. He has written more than 30 books and maintains the popular Spreadsheet Page at http://spreadsheetpage.com