Gunter Geiger is a software programmer and designer of interactive music applications. He currently works as CEO of Reactable Systems a company which specializes in new musical interaction concepts through its Reactable musical instrument and the Reactable line of mobile applications. He is one of the founders of the Pure Data community and has been engaged in free tools for musical production on the Linux operating system. He studied at the Institute for Electronic Music in Graz, Austria and the Music Technology Group in Barcelona, Spain and is currently living and working in Barcelona.