A pioneer in multimedia and networking, Ralf Steinmetz’s work opened up further research in topics such as distributed systems, e-learning, and serious games. The contributions in this volume reflect his huge impact on research, technical developments, and careers in the areas of multimedia and networking: in Part I, the chapters discuss past research results and their impact, often applying a survey style; in Part II, researchers present current results; and in Part III, the chapters give an outlook on future research directions.