I am the guy who started the GeoGebra project and hacked the first version. Today, I am very happy to lead a great team of enthusiastic programmers and researchers both in our offices as well as from our community around the world. My day job is at the university of Linz where I get to think with teacher students about learning and teaching of mathematics. Thanks to my kids and family I don't only get to work hard but to play even harder! Have fun and hope to see you around in our community!