Stephen Marshall is Professor in Urban Morphology and Urban Design at the Bartlett School of Planning, University College London. Dr Marshall has over twenty five years’ experience in the built environment fields, initially in consultancy and subsequently in academia. His principal research interests are in urban morphology and street layout, and their relationships with urban formative processes, including urban design, coding and planning. He has written or edited several books, including Streets and Patterns (2005), Land Use and Transport (with David Banister), Cities, Design and Evolution (2009) and Urban Coding and Planning (2011). He was Chair of the Editorial Board of Urban Design and Planning (Proceedings of the Institution of Civil Engineers journal series) from its launch to 2012; and is now co-editor of Built Environment journal (https://www.alexandrinepress.co.uk/built-environment).