Dr Michael Kay is a member of the systems architecture team at Software AG. He represents Software AG on the XSL and XQuery working groups of the W3C, and is editor of the XSLT 2.0 specification. He is widely known through his book XSLT Programmers Reference published by Wrox Press.Within Software AG, Michael Kay provides consultancy on XML standards and specifications to internal projects both in the product development units and in field engineering.Dr. Kay has 25 years' experience in the IT industry. His Ph.D was gained at the University of Cambridge for work on database management systems. He has led design teams for a series of software development projects encompassing database software, free text retrieval software, and software engineering repositories, and has provided strategic consultancy to clients implementing eBusiness solutions in a number of industry sectors.