Team

He circumnavigated the globe in a 4L car to promote microfinance, ran six consecutive marathons in the Sahara Desert, cycled across Europe twice, and sailed across the Atlantic. In 2019, he became the first French —and the youngest in the world— to ski to the South Pole solo and unsupported (Guinness World Records).

A committed advocate for climate action, Matthieu has served as spokesperson for the Cryosphere Pavilion at the United Nations Ocean Conference in 2025. He has led several educational expeditions in the Alps, the Pamirs, Greenland, and Antarctica.

As a passionate communicator, he regularly speaks at schools, companies, and international conferences to share his field experiences, raise awareness of glaciers and polar regions, and explain their critical role in life and Earth's climate.

As the founder of the 90° SUD Association, he works alongside the scientific community to collect data, raise awareness, and drive meaningful change.

Matthieu is the author of Le Continent blanc and 4L, Un tour du monde du microcrédit, and has produced several documentaries for Ushuaïa TV. He holds degrees from King's College London and Sciences Po Paris, and serves on the boards of the Témoins Polaires and Paul-Émile Victor foundations.

He currently leads Under Antarctica, a three-month kite-ski expedition across Antarctica, aimed at studying ancient and recent ice layers to better predict the continent's future contribution to sea-level rise.

Heïdi is a member of The Explorers Club and has received several prestigious accolades, including the first Shackleton Medal for the Protection of Polar Regions in 2022 and the French “Rayonnement” Prize for her environmental work in 2023. She also joins the 2024 cohort of European Young Leaders by Friends of Europe, representing France. Heïdi serves on the board Protect Our Winters-Europe and is actively involved in numerous climate awareness associations, including 90° SUD, Global Choices, Témoins Polaires, La Fondation Eau, Neige et Glace, Demain C'est Nous, the Snowleader Foundation and the Sustainable Mountain Alliance. In 2025, she joined the advisory board of the UN International Year of Glaciers' Preservation.

As a leading voice in climate advocacy, Heïdi works for the Programme de surveillance et d'évaluation de l'Arctique (AMAP), a working group under the Arctic Council, coordinating research on climate, pollutants, human health, and ecosystems in the Arctic. Beyond her role at AMAP, Heïdi dedicates her efforts to raising awareness about climate issues among governments, communities, the general public, and businesses, motivating concrete action against climate change.

Heïdi leads scientific expeditions across polar and equatorial regions, including the Climate Sentinels expedition and a mission on tropical glaciers with UNESCO, and the Uganda Wildlife Authority. Regularly contributing to documentaries for National Geographic, BBC, ZDF, ITV, and France Télévisions, she is currently featured in the National Geographic series Arctic Ascent with Alex Honnold on Nat Geo / Disney+.