Georgina Mace was pivotal in the development of the SHEFS proposal and its progress, as a key co-investigator during the first three and a half years of the Programme. The whole SHEFS team were incredibly grateful for her insight and input over this time. Georgina was Professor of Biodiversity and Ecosystems at the University College London (UCL) Centre for Biodiversity and Environment Research (CBER). Her research interests were in measuring the trends and consequences of biodiversity loss and ecosystem change, especially in the context of climate and other global changes. Her work has contributed to methods for identifying species at risk of extinction in the IUCN Red List of Threatened Species, and to assessing biodiversity in relation to ecosystem services. Her later work focused on the links between environmental conditions and poverty alleviation, and debates concerning natural capital accounting. She was a member of the UK Natural Capital Committee from 2012 to 2018, advising the UK government, and a member of the Climate Change Committee Adaptation Sub-Committee from 2018 until her passing in September 2020, providing the government with expert advice on preparing for and adapting to climate change.