DR. MARK LITTLE, Chief Architect, Transactions for Arjuna Technologies, was formerly Distinguished Engineer and Architect at HP. There, he led the teams developing J2EE and Web services transactions products. He is specification lead for JSR 156: Java API for XML Transactions, and was transactions architect for Bluestone. JONATHAN MARON, Consultant Member of Technical Staff at Oracle, specializes in transactional Java middleware. As Principal Architect for HP's Application Server, he helped implement most of the infrastructure discussed in this book. GREG PAVLIK, Consultant Member of Technical Staff at Oracle, specializes in web services and transactional middleware. A former Distinguished Engineer at HP, he was Chief Architect for HP's Application Server Division.