Sustainability has become a guiding principle of the 21st century. For the architectural office Bob Gysin + Partner BGP, this is not only an ecological premise but also stimulates and drives its architectural work. They have been setting standards with this approach for 40 years and now rank among the leaders and pioneers of the European architecture scene. This catalogue provides insight into their modes of thought and their planning and implementation practices, which can be attributed to the uniqueness of their projects—from the Chriesbach aquatic research institute to the new headquarters of Greenpeace—which repeatedly succeed in transgressing boundaries as well as connecting social involvement and cultural relevance with one another.