Vivek Chopra has over ten years of experience as a software developer, architect, and team lead, with extensive experience with Web services, J2EE, and middleware technologies. He has worked and consulted at a number of Silicon Valley companies and startups and has (pending) patents on Web services. Vivek actively writes about technology and has coauthored half a dozen books on topics such as opensource software, Java, XML, and Web services. He contributes to open source, too, and has developed parts of the uddi4j library, an open-source Java API for UDDI. Sing Li, first bit by the microcomputer bug in 1978, has grown up with the microprocessor age. His first personal computer was a do-it-yourself Netronics COSMIC ELF computer with 256 bytes of memory, mail-ordered from the back pages of Popular Electronics magazine. Currently, Sing is a consultant, system designer, open-source software contributor, and freelance writer. He writes for several popular technical journals and e-zines and is the creator of the Internet Global Phone, one of the very first Internet phones available. He has authored and coauthored numerous books across diverse technical topics, including JSP, Tomcat, servlets, XML, Jini, and JXTA. Rupert Jones is a Technical Lead for J2EE projects at Internet Business Systems. Over the past six years, Rupert has provided software development and consulting services for blue-chip companies, both in Australia and internationally. He lives and works in Melbourne, Australia. Rupert can be contacted at firstname.lastname@example.org. Jon Eaves has been developing software in a variety of languages and domains for over 15 years. He is currently employed by ThoughtWorks, developing large-scale enterprise systems using J2EE. When he can find spare time, he develops J2ME/MIDP applications and works on the BouncyCastle Crypto APIs (www.bouncycastle.org). Jon can be reached at email@example.com. John T. Bell has more than 20 years of software development experience and currently serves as the lead software architect for the Web site of a major hospitality company based in Bethesda, Maryland. He is also an adjunct professor, teaching server-side Java technologies for the Center for Applied Information Technology at Towson State University. He has a master's degree in Computer Systems Management and a bachelor's degree in Electrical Engineering, both from the University of Maryland. This is Mr. Bell's third contribution to a Wrox title. He is also the author of The J2EE Open Source Toolkit.