Darren is an independent Chartered Mechanical Engineer and Building Physics specialist with over 25 years' experience of mechanical systems design and 20 years' experience in building simulation. He's been a member of the CIBSE Building Simulation Group for a number of years and is helping to develop certification that is absent for Building Performance Modelling. Darren has taken part in pioneering modelling studies to help show how the performance gap can be closed and how we can use models to reduce the actual in use energy consumption in buildings.