Christoph Mäckler is an architect based in Frankfurt am Main, an emeritus professor of urban design at the TU Dortmund, and the director of the Deutsches Institut für Stadtbaukunst, which he founded in 2008. He studied architecture in Darmstadt and Aachen. From 1990 to 1997, he was a visiting professor at the universities in Naples, Braunschweig, and Hanover, as well as a member of the Internationale Bauakademie Berlin. Wolfgang Sonne is professor for architectural history and theory at the TU Dortmund since 2007. He is the scientific director of the Baukunstarchiv NRW as well as deputy director and cofounder of the Deutsches Institut für Stadtbaukunst. He studied art history and archaeology in Munich, Paris, and Berlin, and has taught at institutions including ETH Zurich and the University of Strathclyde in Glasgow.