Martin Kaltenbrunner is professor at the Interface Culture Lab at the University of Art and Design in Linz. He has been responsible for the interaction design of the Reactable - an electronic musical instrument with a tabletop user interface. In this context he developed the open source tangible interaction framework reacTIVision and the related TUIO protocol, which have been since widely employed for the realization of tangible tabletop applications.

Florian Echtler is junior professor at the Faculty of Media at Bauhaus-Universität Weimar. His research interests focus on formal languages for gesture descriptions and design of multimodal development frameworks. Additional topics covered by his research include computer vision for HCI applications, sensor technology and rapid prototyping.