Christoph Kronhagel is an architect and pioneer in Mediatecture - the transformation of the architectural space into interfaces with the digital world. In 1991, he founded ag4 in Cologne - an interdisciplinary team, which has helped many corporations and brands to articulate themselves digitally via media-tectonic installations. In this context, ag4 developed the first transparent media façade for T-Mobile in Bonn. Many other international projects followed. Since then, Christoph has started to develop applications and innovations for DooH. Together with his two partners (from IT and advertising business) he founded Urbansite GmbH in 2015. Urbansite consults, develops, invests in and provides innovative DooH solutions.