Gabriel is a Marie Curie Research Fellow working on resource efficiency, material/energy services and the circular economy, as part of the CircNexSt project. In 2020, Gabriel completed his PhD in Sustainable Energy Systems at the University of Lisbon (Portugal). He focused on the stock-flow-service nexus to facilitate a more comprehensive analysis of resource production, consumption, and accumulation. Prior to joining the Resource Efficiency Collective, Gabriel worked on several H2020 projects, where he assessed the sustainability of emerging technologies. He also has over fifteen years of experience working as a consultant and sustainability professional. He advised Latin American companies in the public transport, infrastructure, and hydrocarbon sectors. Gabriel obtained an Environmental Engineering degree at La Salle University (Colombia) and a master’s degree in Energy Efficiency and Industrial Ecology at the University of Zaragoza (Spain).