The architectural office Diener & Diener pays close attention to the architectural history of the city and modernity as it develops new types of buildings. This has been evident since its first projects, the residential development in the heart of Kleinbasel and the residential buildings in the St-Alban-Tal, a historically sensitive Basel neighborhood on the banks of the Rhein. As it continues to develop contemporary residential buildings, the office of Diener & Diener maintains its focus on this subject matter. The results of this focus can be seen in the projects they realized on the Java and KNSM Island in Amsterdam, the Basel Markthalle Tower, or the residential building of the Mustersiedlung Hadersdorf, Vienna. Planning and design projects also include office and research buildings such as the Swiss Re headquarters on Zurich's Mythenquai, the Baloîse Group in Basel, the Forum 3 on the Novartis Campus in Basel, as well as the laboratory building on the Novartis Campus in Shanghai. When working on architectural projects in culturally sensitive contexts, Diener & Diener has sought to engage with artists such as Helmut Federle (Vienna) or Josef Felix Müller (St. Gallen). In their search for the unique expression of a specific location, the architects and artists would reciprocally seek to radically amplify the respective ideas of architecture and art: only where art becomes an inseparable element of the architectural design while maintaining its independence can art extend architecture. Today, Diener & Diener employs 50 architects in Basel and Berlin from many different nations. Roger Diener established the office Diener & Diener Architects in 1980 with his father and just four years after joining the office Marcus Diener Architect, the office his father formed in Basel in 1942. Roger Diener has led the office Diener & Diener with Terese Erngaard, Michael Roth, and Andreas Rüedi since 2011.