Matthias Wählisch is a full professor and holds the Chair of Distributed and Networked Systems at TU Dresden. His research includes the design and evaluation of networking protocols and architectures as well as Internet measurements and analysis. Together with his team, he aims for real-world impact based on first-class scientific results to improve the Internet, its services, and applications. This challenge was tackled several times successfully. The research results of his group helped to improve the security of the current Internet infrastructure, introduced new services, and enabled commercial products. Matthias is actively involved in the Internet Engineering Task Force (IETF) since 2005 and coordinates multiple open-source projects. Among others he co-founded RIOT, the friendly operating system for the Internet of Things, and RTRlib, a library for route origin validation. He is a member of the Advisory Boards of BCIX, the Berlin Commercial Internet Exchange e.V., and INSO, the Internet Namespace Security Observatory, which is supported by the Internet Society (ISOC) and the Internet Corporation for Assigned Names and Numbers (ICANN).