Bernd Kreimeier is a physicist, a writer, and a software engineer. Following seven years as research staff at the universities of Dusseldorf and Bonn, and a 2-year sabbatical as a full-time writer in Galway, Ireland, he has professionally worked in the game industry since 1999, for companies as diverse as Oddworld Inhabitants, Raven Software, Loki Entertainment Software, and Genuine Games. He has presented at GDC, in particular on the topic of formal game design methods based on play and design patterns, an approach derived from the pattern language initiated by Christopher Alexander. His areas of interest are usability testing and design validation, tool support for rapid prototyping, and tool support for a formalized design process. He is not a game designer.