Gerard M. Verschuuren , PhD, is a Microsoft Certified Professional specializing in C#.NET, VB, VBA, and VB.NET. He is the principal of Genesis PC, where he teaches and advises on the use of curve-fitting software such as Excel and XLfit in data, regression, and statistical analyses. His clients include Abbott, Bose, IBM, Liberty Mutual, Massachusetts General Hospital, and Harvard University. He is the author of numerous computer programming books, including Excel 2007 VBA , From VBA to VSTO , Master the Web , and Slide Your Way Through Excel VBA . He lives in Atkinson, New Hampshire.