Steven Holzner, PhD,is the author of nearly 100 technology books including Ajax For Dummies and the Ajax Visual Blueprint. He specializes in writing about online applications, and has authored popular books on the components of Ajax including JavaScript, XML, browser objects, and Web services. He teaches classes to programmers around the country on the central skill in Ajax—using XML online and in-depth. He has been a contributing editor to PC Magazine, and was on the faculty at Cornell University and MIT.