Author and architect Hattie Hartman is sustainability editor at the Architects' Journal. An enthusiastic champion of sustainable design, Hattie welcomes every opportunity to engage with practitioners in the UK and abroad who are leading the way. Hattie hosts the A J's Climate Champions podcast and is a co-author of Energy People Buildings, RIBA Publishing 2021. She participates widely in industry juries, chairs events and lectures on design for climate emergency.

Joe Jack Williams is an Associate and researcher at FCBStudios and, alongside Ian Taylor, leads environmental research for the practice, identifying, developing and enabling research across sectors and projects. He is a Certified Passivhaus Consultant. He has taught at a number of universities in the UK, including Oxford Brookes, UCL, UWE, University of Bath, and London Met, and is part of core research groups within Architects Declare, CIBSE and LETI.