The architectural practice Duplex Architekten was founded by Anne Kaestle and Dan Schürch in Zurich in 2007. Besides the headquarters in Switzerland, Duplex has run branch offices in Düsseldorf and Hamburg since 2011. In 2020 Duplex opened their Paris office Duplex Architectes. The management level is supported by three associates, Konrad Mangold (Zurich), Sarah Escher (Düsseldorf), Christof Weber (Hamburg) and Henrik Siebenpfeiffer (Paris). Duplex Architekten plan and design projects of various scales and building tasks, with their expertise ranging from private homes to commercial buildings, office and residential complexes, school buildings through to whole urban districts.