Christian Siefkes studied computer science and philosophy. He graduated at the Free University of Berlin in the Department for Computer Science in 2007. He currently lives in Berlin and works as a freelance software developer and author. On keimform.de, he writes about the emancipatory potential of free software and other forms of commons-based peer production. He also runs the website siefkes.net. His book "From Exchange to Contributions: Generalizing Peer Production into the Physical World" was published in 2008. Since 2011, Siefkes has been employed by Rocket Internet, an incubator for internet startups.