Bill Sempf has spent an inordinate amount of time in the last several years writing about XML Web Services. He is the author of Visual Basic 2005 for Dummies, and a coauthor of Effective Visual Studio.NET, Professional ASP.NET Web Services and Professional VB.NET, as well as a frequent contributor to MSDN, Builder.com, Hardcore Web Services, Inside Web Development Journal and Intranet Journal. He has recently been an invited speaker for the International XML Web Services Expo and the Association of Information Technology Professionals. A graduate of The Ohio State University with a Bachelor's of Science in Business Administration, Microsoft Certified Professional, Certified Internet Business Strategist and Certified Internet Webmaster, Bill has developed over one hundred web applications for startups and Fortune 50 companies alike.