Gauthier has been at the forefront of the environmental assessment of the digital sector from almost ten years. He is a specialist of the material layer powering global digitalization. He follows most materials flows from mining sites, supply chain bottlenecks, chemical plants, to semiconductor foundries. Furthermore, he is a recognized expert in Europe in assessing the net environmental impacts of digital solutions, and has been monitoring and participating in standardization work for the European Commission (EGDC) since 2022. Over the years, he has advised the European Commission, The World Bank, France Strategie, and ADEME, among others.