Christian Siefkes (Germany) is a software engineer who lives in Berlin. His main research interest is the emancipatory potential of free software and other forms of commons-based peer production. He blogs at http://keimform.de. His publications include From Exchange to Contributions (Berlin 2007) and The Emergence of Benefit-driven Production (Proceedings of OKCon 2011).
Or go to Central Books & type in "Wealth of the Commons"