Developer from Munich, Germany. Runs the company Starzel.de. Plone core-developer, did time on the Plone Foundation Board of Directors. Head of Plone Training Team and author of the Mastering Plone Training. Project-Lead for porting Plone to Python 3. Author of plone.app.contenttypes, collective.exportimport and a bunch of other packages. Loves teaching and is fiercely dedicated to Open Source.