Stefan Stieglitz is Professor and head of the research group for Professional Communication in Electronic Media /Social Media at the University of Duisburg-Essen. Furthermore, he is director of the Competence Center Connected Organization which aims at intensifying the knowledge transfer between research and the business world. Previously he hold a position as an assistant professor at University of Münster at the department of information systems. His work focuses on the impact of social media on companies and society. He investigates and develops applications and methods of social media analytics in order to realize empirical research in domains such as marketing, internal corporate communication, and crisis communication.