Bill Bordass is a scientist who worked in the architectural and engineering practice RMJM, and led its building services, environmental engineering and energy group. He then set up on his own, concentrating on in-use performance of public and commercial buildings, including historic buildings, and providing strategic and detailed advice. He has worked on building energy certification and benchmarking in the UK, EU, Australia and California. He is research and policy adviser to Usable Buildings, which disseminates information on building performance in use and attempts to influence the industry, its clients, occupiers, managers and government. Publications include the Probe series of 20 post-occupancy evaluations, the Soft Landings Framework, and Special issues of Building Research & Information on Post-occupancy Evaluation and on New Professionalism. Recent work includes Design for Performance (which seeks to eliminate energy performance gaps in new rented offices), a 2020 paper on energy and carbon performance indicators, and advice to Historic England on retrofit.