Gerd Stumme is Full Professor of Computer Science. He is leading the Hertie Chair on Knowledge and Data Engineering at the University of Kassel, and full member of L3S Research Center. Gerd Stumme earned his PhD in 1997 at Darmstadt University of Technology, and his Habilitation at the Institute AIFB of the University of Karlsruhe in 2002. In 1999/2000 he was Visiting Professor at the University of Clermont-Ferrand, France, and Substitute Professor for Machine Learning and Knowledge Discovery at the University of Magdeburg in 2003. Gerd Stumme published over 80 articles at national and international conferences and in journals, and chaired several workshops and conferences. He is member in the Editorial Boards of the Intl. Journal on Data Warehousing and Mining and of the International Conference on Conceptual Structures, and was also member of several conference and workshop Program Committees. Gerd Stumme is leading and led several national and European projects. The research group is running the social bookmark and publication sharing system BibSonomy.

Juergen studied Computer Science at the Hochschule Darmstadt University of Applied Sciences. Afterwards, he was a research assistant at the Department of Computer Science in the BMBF research project Next Generation Telecommunication Factory (NextFactor). Now, he is part of the Knowledge and Data Engineering group / L3S Reseach Center since August 2011.

Currently, Andreas is professor at the university of Würzburg and associate member of the L3S. Prior, he was a senior researcher at the university of Kassel. He is working in the area of Data Mining, Semantic Web and Mining of Social Media and is directing the BibSonomy project at the KDE group of the university of Kassel. He started its research at the AIFB Institute at the University of Karlsruhe where he was working on text mining, ontology learning and semantic web related topics.

As of July 2011, Martin Becker is a Ph.D. student at the University of Würzburg, Germany, where he received the Degree in Computer Science in 2011 after spending an academic year at the University of Texas at Austin, USA, in 2009/10 and finishing up his diploma thesis in the field of constraint based pattern mining. He is currently working as a research assistant at the L3S Research Center for Web Science and takes part in the EveryAware project.

Martin Atzmueller is a senior researcher at the University of Kassel. He studied Computer Science at the University of Texas at Austin (USA) and at the University of Würzburg (Germany) where he completed his MSc (Diploma) in Computer Science. Martin earned his doctorate (PhD) from the University of Würzburg. He published more than 60 research papers in refereed international journals and conferences, and has been author, co-author, and co-editor of several books. His research areas include data mining, natural language processing, machine learning, web science, and the social semantic web.