Julia Marton-Lefèvre is an independent expert on sustainable development. She is a board member of NGOs, foundations, universities and private companies. She is currently Chair of several organisations, including the Board of Directors of Bioversity International Alliance and CIAT (International Center for Tropical Agriculture), the Executive Committee of the Tyler Prize for Environmental Achievement, the Board of the Villars Institute, the Donors' Council of the Critical Ecosystem Partnership Fund, and the Strategic Advisory Council of IDDRI.

She was a member of the IPBES Bureau from 2019 to 20222. Until 2015, Julia Marton-Lefèvre was Director General of the International Union for Conservation of Nature (IUCN), the world's largest conservation and environmental network. As Director General, she was also CEO of the IUCN Secretariat. Prior to that, she was Rector of the United Nations University for Peace (UPEACE), whose main campus is in Costa Rica. UPEACE is an international university that offers courses, case studies and research on issues related to peace, conflict and environmental security.

Julia Marton-Lefèvre was born in Hungary, educated in the United States and in France, and having lived in several continents, considers herself a global citizen.