climate change. Water Resources: Hall developed methods for planning water resources in the context of uncertain future climate changes. In 2018, Hall and his former doctoral student Edoardo Borgomeo were awarded the Prince Sultan Abdulaziz International Prize in the category of Water Management and Protection for developing a new risk-based framework to assess water security and plan water supply infrastructure in times of climate change. His research has focused on the quantification of risks from water resource systems especially the risks of water shortages and harmful water quality for people and the environment. This has contributed to the concept and literature of water security although this approach has been criticised as reductionist. With Claudia Sadoff and David Grey he was co-chair of the Global water partnership/OECD Task Force on the Economics of Water Security and Sustainable Growth. Hall is on the technical panel for the National Infrastructure Commission. His analysis of water risks in Britain provided evidence for the National Infrastructure Commission's 2018 report Preparing for a Drier Future, for the Environment Agency's National framework for Water Resources and for the UK water Regulators' Alliance for Progressing Infrastructure Development (RAPID). He is editor of the AGU journal Water Resources Research. Flood risk: Hall developed the flood risk analysis for the first National Flood Risk Assessment (NaFRA) in England and Wales. The same research now also underpins the Environment Agency's Long Term Investment Strategy. He also developed the framework for uncertainty analysis in appraisal of options for protecting London from flooding over the 21st Century, as part of the Environment Agency's 2012 Thames Estuary 2100 project. He was coordinating lead author in the Government Office of Science and Technology's Foresight Future Flooding project and was a member of the Scientific Advisory Group for Emergencies (SAGE) for the 2014 floods emergency. He was advisor during the 2016 floods and the subsequent National Flood Resilience Review. Hall has published two books on flooding: Flood Risk Management in Europe: Innovation in Policy and Practice and Applied Uncertainty in Flood Risk Management. Coastal Change: With Mike Walkden, Hall developed the SCAPE model which can predict coastal cliff erosion decades into the future. SCAPE has been used to predict the impacts of climate change for coastal towns and nuclear sites. He was part of the team that developed the Tyndall Coastal Simulator which models the response of the East Anglian coast to climate change. Hall conceived