Rickard Oberg is popular among Java developers. He has given seminars at all main Java conferences world wide. He worked as an architect at JBoss and other popular OpenSource Java frameworks, and wrote a book on RMI. In recent years, he has become famous as an Aspect Oriented Programming (AOP) crusader. He has worked with bleeding edge AOP in a portal product that has become a great commercial success, and is currently working on Qi4j at Jayway.