For the Graz-based architect Ernst Giselbrecht, sustainability is not merely an expression en vogue. It is his mission to create buildings that are both energy efficient and innovative. In order to accomplish this, his architecture need not only fit into the urban or rural surroundings or the cultural contexts, it also has to blend into its energy conscious context in an intelligent way. A voluminous task to say the least. Besides sustainability, Giselbrecht’s work is defined by a rather rational architectural language. Considered one of the leading figures of the world-famous Graz school and formal expressionism, he nowadays concentrates on factual and structural design as well as an unpretentious use of contemporary technology.