2001 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 All All Challenges in Opinion Mining, Hochschule Darmstadt University of Applied Sciences, Germany, January 22, 2014. Semantic Documentation for Conservators, Semantic Technologies Symposium, Berlin, Germany, September 27, 2013. My Research Foci after my PhD Thesis, Magdeburger-Informatik-Tage. 2. Doktorandentagung 2013. Magdeburg, Germany, July 16, 2013. The Future of the Institute for Information and Documentation at the Potsdam University of Potsdam, Social Memory – Positionen und Innovationen in der Mediendokumentation. Frühjahrstagung 2013 Waaghaus in Ravensburg., April 23, 2013. User Modeling in Knowledge Mining and Assessment, Technische Universität Darmstadt, Germany, February 29, 2012. Multilingual News Aggregation and Recommendation, Berliner Bibliothekswissenschaftliches Kolloquium (BBK) , Berlin School of Library and Information Science at Humboldt University of Berlin, November, 22 2011. Personalizing Information for the Social Semantic Web, 11th Berlin Semantic Web Meetup - Social Semantic Web 3.0. THESEUS Innovationszentrum, Berlin, Friday, August 5th, 2011. Personalization and context-awareness in Retrieval and Recommender Systems (Keynote), 9th Workshop on INTELLIGENT TECHNIQUES FOR WEB PERSONALIZATION and RECOMMENDER SYSTEMS (ITWP'11). In conjunction with the International Joint Conferences on Artificial Intelligence (IJCAI 2011), Barcelona, Spain, July 16, 2011. Multilingual Lexical Linked Data, Open Linguistics Workshop, at the annual Open Knowledge Conference of the Open Knowledge Foundation (OKCon 2011), Berlin, June 30, 2011. SPIGA - A Multilingual News Aggregator, Federal Press Office, Federal Government (Referat Informationstechnik, Presse- und Informationsamt der Bundesregierung), Berlin, Mai 12, 2011. Documents in the Web: Analysing their Term Definition in a Digital Connected Context, University of Applied Science, Potsdam, Germany, April 11, 2011. Semantics, Personalization and Context in Search and Recommender Systems, Technische Universität Darmstadt, Germany, November 22, 2010. Semantic Personalized Information Management - What is the Future? (Keynote), First Workshop on Semantic Personalized Information Management (SPIM 2010), May 18, 2010. Semantic Personalized Information Management for Scientists, Berliner Bibliothekswissenschaftliches Kolloquium (BBK) , Berlin School of Library and Information Science at Humboldt University of Berlin, April 27, 2010. Organizing Web Documents Using Semantic-Based Categorization Approaches, Fakultät IV für Elektrotechnik und Informatik, DAI-Labor, Technical University of Berlin, August 13, 2009. Supporting Users in the Semantic Web Search, Institut für Angewandte Informatik und Formale Beschreibungsverfahren (AIFB), University of Karlsruhe (TH), March 09, 2009. Multilingual Semantic Search and Browsing Tools, Language Technology Days, JMO conference complex, European Parliament, Luxembourg, January 15, 2009. Semantic Search in Digital Databases, Cognitive Intraction Technology, Center of Excellence, University of Bielefeld, January 05, 2009. The Future of the Search in Digital Libraries, Institut for Library and Information Science (IBI), Humbolt University of Berlin, October 5, 2008. Semantic Support for Multilingual Text Retrieval, University of Edinburgh, Institute for Communicating and Collaborative Systems, April 27, 2007. Semantic Information Retrieval and NLP Techniques in Service Discovery and Retrieval, Ubiquitous Knowledge Processing (UKP) Lab, Technical University of Darmstadt, March 13, 2007. Semantic Support for Cross-language Text Retrieval, University of Magdeburg, Department of Computer Science, Data and Knowledge Engineering, December 14, 2006. Ontology-based Online Categorization of Web Pages, University of Magdeburg, 29. Annual Conference of the German Classification Society (GfKl 2005), 2005. The use of Markup languages and Ontologies in Information Retrieval, University of Turin, Department of linguistics, Applied Linguistics and Linguistic Engineering, November 9, 2004. Human Computer Interaction: Agent technology in the Internet, Research Institute ITC-IRST, TCC Division Cognitive and Communication Technologies, Povo-Trento, Italy, December 10, 2001.