Wonseok Kim is a senior developer at TmaxSoft, South Korea. He works on the development of Tmax Application Server - very popular in Korea. He has been participated in JCP such as JSR 244 (Java EE 5) and JSR 220 (EJB 3.0). He is also a contributor to GlassFish project. Prior to Java EE he had developed NMS and OSS systems for telecommunications in Java. Now he has concerns primarily on EJB and persistence technologies and is working on them.