Herzog & de Meuron Basel Ltd. , or Herzog & de Meuron Architekten, BSA/SIA/ETH (HdM), is a Swiss architecture firm with its head office in Basel, Switzerland. The careers of founders and senior partners Jacques Herzog (born 19 April 1950), and Pierre de Meuron (born 8 May 1950), closely paralleled one another, with both attending the Swiss Federal Institute of Technology (ETH) in Zürich.