Guillermo is Professor of Fire Science at the Department of Mechanical Engineering of Imperial College London, and Editor-in-Chief of the journal Fire Technology. He is Fellow of the Combustion Institute. His research is centred on heat transfer, combustion and fire, by the combination of lab experiments and computer models. The purpose of his work is to reduce the worldwide burden of accidental fires and protect people, their property, and the environment. His research portfolio is ample, but over the last 20 years he is best known in three areas: 1) how synthetic polymers and wood ignite so we can prevent fires from starting; 2) how modern materials respond to fire so engineers can design better structures; and 3) how wildfires spread so rural communities can be protected. Guillermo's work has been recognised internationally with a number of scientific awards like the 2020 Research Excellence Award from the Combustion Institute, the 2018 SFPE Guise Medal from the Society of Fire Engineers, or the 2016 Early Career Award for Excellence from the International Association of Wildland Fires.