Marcin Grzegorzek is Assistant Professor at the University of Siegen where he leads the Research Group for Pattern Recognition. He received his PhD with distinction from the University Erlangen- Nuremberg in 2007. From 2006 to 2008 he was Research Assistant at the Queen Mary, University of London. From 2008 to 2010 he worked as Lecturer for the University Koblenz-Landau. Marcin is General Chair of the SAMT 2010 conference, the 5th International Conference on Semantic and DigitalMedia Technologies. Moreover, he acts as Secretary in the Executive Board of the SMaRT (Semantic Multimedia Research and Technology) Association. His research interests focus on object recognition, multimedia retrieval, and knowledge-based image processing