I am co-founder of Reactable Systems in Barcelona, Spain where I am working on the interaction design of the reacTable - a novel electronic music instrument and on the development of reacTIVision, an open source multi-touch fiducial tracking framework. Together with Ross Bencina, Enrico Costanza and Till Bovermann I developed the TUIO protocol, which now has been widely adopted for multi-touch applications. I am the author of the TUIO toolkit including the Simulator and most client implementations.