Prof. Dr. Ing. Tillmann Klein is Professor of Building Product Innovation at the TU Delft Faculty of Architecture and the Built Environment. Here, he headed the Façade Research Group from 2005 to 2018, alongside which he was also director of the façade consulting office Imagine Envelope b.v. in The Hague from 2008 to 2016. He was also a guest professor at the Technical University of Munich from 2015 to 2018. Klein organises the international façade conference series “The Future Envelope” at TU Delft and is editor in chief of the scientific open access “Journal of Façade Design and Engineering”.