Simon is a founding director of architecture practice Henley Halebrown.
He combines practice with teaching, writing and research, and is the author of The Architecture of Parking (Thames & Hudson, 2007), which won the RIBA International Book Award for Construction in 2008, and Redefining Brutalism (RIBA Publications, 2017).
Simon teaches on the MArch programme at Kingston University, where he himself is studying for a PhD by Practice. He is a Fellow of the Royal Society of Arts, an Academy of Urbanism Academician and Brother of the Art Workers Guild.