Lukas Jungmann is the specification project co-lead for Jakarta Persistence, and the lead for a number of other Jakarta Specification projects including Jakarta Activation, Mail, XML Binding, SOAP with Attachments, and XML Web Services. He is a contributor to Jakarta Platform, JSON Processing, JSON Binding specification projects and is lead for a number of implementation projects of various Jakarta specifications including EclipseLink, Eclipse Metro and Eclipse Angus. He holds a Bachelor’s degree in Applied Informatics from University of Finance and Administration in Prague, Czech Republic, and has over 15 years’ experience working with Enterprise Java related technologies. He has spoken at numerous conferences around the world. He is employed as a software developer at Oracle in Prague, Czech Republic, and is married with three kids and one cat.Mike Keith is a co-specification lead for JPA 1.0 and a member of the JPA 2.0 and JPA 2.1 expert groups. He sits on a number of other Java Community Process expert groups and the Enterprise Expert Group (EEG) in the OSGi Alliance. He holds a Masters degree in Computer Science from Carleton University, and has over 20 years experience in persistence and distributed systems research and practice.He has written papers and articles on JPA and spoken at numerous conferences around the world. He is employed as an architect at Oracle in Ottawa, Canada,and is married with four kids and two dogs.Merrick Schincariol is a senior engineer for the Oracle OC4J Java EE Container. He was a lead engineer for Oracle's EJB 3.0 release and co-author of Pro EJB 3: Java Persistence API. Before joining Oracle, Merrick developed enterprise and large-scale systems for the telecommunications industry.Massimo Nardone has more than 23 years of experiences in Security, Web/Mobile development, Cloud and IT Architecture and has been programming and teaching how to program with Android, Perl, PHP, Java, VB, Python, C/C++ and MySQL for more than 20 years. He currently works as Chief Information Security Office (CISO) for Cargotec Oyj and he is member of the ISACA Finland Chapter Board. Massimo has provided technical review for more than 40 IT books, and is the coauthor of Pro Android Games (Apress, 2015).