Gunter Geiger holds a MA in Telematics and Sound Engineering from the Graz University of Technology, Austria and a DEA in Audiovisual Communication from the Pompeu Fabra University in Barcelona, Spain. His interest in free software for music lead to his involvement in the AGNULA EC project. He is a pioneer in mobile music applications, being the main programmer and thinker behind the RjDj interactive mobile application. Being part of the university team who built the Reactable tangible synthesiser he is currently CEO of Reactable Systems in Barcelona.