Till Schuemmer is a researcher at the Collaborative Systems Group at the FernUniversitaet in Hagen, the German Distance Teaching University. In his research work, he has been concentrating on distilling common functionalities and best practices from the research area of Computer-Supported Collaborative Work. In his most recent book, Patterns for Computer-Mediated Interaction, he co-authored a pattern language that identifies the basic building blocks for supporting computer-mediated interaction. In his current research, he is complementing the language with domain oriented collaboration patterns as well as technology-oriented services. He holds a Diploma in Informatics from the University of Damstadt and a Dr. rer. nat. from the University of Hagen for his research on End-User Centered development of collaborative systems.