Martin Kaltenbrunner is professor for Tangible Interaction Design and director of the Tangible Music Lab at the University of Arts Linz in Austria. His research work concentrates on Tangible User Interfaces in general and the design of postdigital Musical Instruments in particular. In this context he has been mainly known for his work on the Reactable, a novel electronic music instrument, which he co-developed during his work at the Universitat Pompeu Fabra in Barcelona, Spain.