Asif Din has over 20 years’ experience working on environmental low energy buildings and supply chains, including PassivHaus and Zero Energy Developments. He undertakes design reviews for all projects at Perkins&Will, and has changed design practices to include a circular economy carbon strategy document or a zero operational carbon costed report for all projects at the end of RIBA Stage 2. Asif has a doctorate in life cycle carbon and is a member of the UK Green Building Council, LETI and RIBA.