He has been involved in Java desktop application and controls development. His current interests include JavaFX, HTML5, and Swing, especially development of custom controls in these technologies. Grunwald is also interested in Java-driven embedded technologies. He is a true believer in open source and has participated in popular projects like JFXtras.org as well as his own projects (Enzo, SteelSeries Swing, SteelSeries Canvas). Gerrit is an active member of the Java community, where he founded and leads the Java User Group Münster (Germany), he co-leads the JavaFX and IoT community, is a JavaOne rockstar and Java Champion. He is a speaker at conferences and user groups internationally.