Spencer de Grey advises Foster + Partners on a range of topics such as the Design Board, charitable giving, and its historic collection. In addition, he acts as a mentor for individuals in the practice. Sustainability is one of his key areas of interest. He has been responsible for a range of projects, including Stansted Airport in London, Commerzbank HQ in Frankfurt, The Great Court at the British Museum in London, Narbo Via in Narbonne and more recently currently Slussen Masterplan in Stockholm.