Prof.dr.ir. Tillmann Klein studied architecture at the RWTH Aachen, obtaining a degree in 1994. From then on, he worked in several architecture offices, later focusing on the construction of metal and glass facades and glass roofs. Simultaneously, he attended the Kunstakademie in Düsseldorf, Klasse Baukunst, completing his studies in 2000 with the title “Meisterschüler”. In 1999 he was co-founder of the architecture office Rheinflügel Baukunst with a focus on art related projects. In 2005 he was awarded the art prize of Nordrhein-Westphalen for young artists. From September 2005 he headed the Façade Research Group at the TU Delft, Faculty of Architecture. Between 2008 and 2016 he was director of the façade consulting office Imagine Envelope b.v. in Den Haag and finished his PhD in 2013. Tillmann Klein organizes the international façade conference series “The Future Envelope” at the TU Delft and is editor in chief of the scientific open access “Journal of Façade Design and Engineering”. Between 2015 and 2018 he was guest professor for Design and Building Envelopes at the TU Munich. In 2018 he became a full professor for Building Product Innovation at the TU Delft and leads the Circular Built Environment Hub at the Faculty of Architecture.