About the Authors

Sameer Tyagi

Sameer Tyagi is employed as an Enterprise Java Architect for Sun Microsystems and works at the Java Center in Burlington, MA. He has eight years of experience in information technology and has co- authored many books in different areas of Java technology. He also writes regularly for Java Pro , Java World , and Java Developers Journal . Sameer can be reached at [e-mail].

Keiron McCammon

Keiron is the CTO for Versant Corporation. He has worked in the IT industry for more than ten years, principally applying object-oriented technologies and techniques for solving business problems. He has hands-on experience in C/C++/Java as well as Corba/J2EE. As the CTO of Versant, Keiron is responsible for defining the product strategy and direction. He has worked with strategic customers in the financial and telecommunications arenas, aiding in the development of distributed object solutions utilizing Java, J2EE, and Versant technologies. Keiron is a member of the JDO expert group (JSR 12) and presents regularly at Java and J2EE conferences and seminars on JDO and J2EE application architecture and development.

Michael Vorburger

Michael currently holds the title of Chief Software Architect at Vertical*I, an enterprise software company focusing on providing solutions to the life sciences industries. Following early drafts of the JDO standard, he was inspired to implement a similarly architected in-house persistence service, which is currently being re-implemented based on standard JDO. He has been giving feedback and exchanging questions on the JDO expert mailing list.

Heiko Bobzin

Heiko Bobzin is a member of the JDO expert group (JSR 12). He led the JDO and ODMG 3.0 implementation at Poet Software, a vendor of object-oriented databases. Prior to joining Poet, he developed a universal communications library including Java, Delphi, VB, and C++ bindings, a TCP stack, ISDN drivers, fax server, and ported the GNU C++ compiler to Microware's OS-9. He presented at Java One 2000, ICJD San Jose, New York in 2001, and many other conferences in the United States and Germany. You can reach him at [e-mail].