Rod Johnson is an enterprise Java architect with extensive experience in the insurance, dot-com, and financial industries. He was the J2EE architect of one of Europe's largest web portals, and he has worked as a consultant on a wide range of projects.
Rod has an arts degree majoring in music and computer science from the University of Sydney. He obtained a Ph.D. in musicology before returning to software development. With a background in C and C++, he has been working with both Java and J2EE since their release. He is actively involved in the Java Community Process as a member of the JSR-154 (Servlet 2.4) and JDO 2.0 Expert Groups. He is the author of the best-selling Expert One-on-One J2EE Design and Development (Wrox, 2002) and has contributed to several other books on J2EE since 2000.
Rod is prominent in the open source community as co-founder of the Spring Framework open source project (www.springframework.org), which grew out of code published with Expert One-on-One J2EE Design and Development. He speaks frequently at leading industry conferences. He is currently based in London.
Rod can be contacted at expert@interface21.com.

Juergen Hoeller is a Senior Systems architect and Consultant at werk3AT, a company that delivers complex web solutions and provides J2EE-based consulting in Austria.
Juergen has a masters degree in Computer Science from the University of Linz, specializing in Java, OO modeling, and software engineering. He has worked on a wide range of projects with numerous J2EE application servers, ranging from enterprise application integration to web-based data visualization.
Juergen has particular experience in developing J2EE web applications, O/R mapping, and transaction management. Juergen is co-lead of the Spring Framework and active in many community forums, including TheServerSide.