Dr. Hatem Haddad is Assistant Professor in Computer Science at Mevlana University (Turkey) and director of the VISP Lab. H. Haddad received a Ph.D. in Computer Science from the Joseph Fourier University of Grenoble (France) in 1987. From 2003 to 2004, he was a Post Doctoral Researcher within VTT Technical Research Centre of Finland and Norwegian University of Science and Technology . From 2004 to 2013, he was Assistant Professor in Computer Science at United Arab Emirates University (UAE) and University of Sousse (Tunisia). His research interests cover information retrieval, natural language processing and data mining. His current research interests are Sentiment Analysis, Social Information Retrieval and Multilingual Information Retrieval.