Heidi Sevestre

Heidi Sevestre is a French glaciologist (born 1988, hometown Annecy) who appears in expedition‑scale climbing films as the scientific specialist embedded with climbing teams. In the National Geographic series collected as Arctic Ascent with Alex Honnold: Mega Episode, Sevestre travels with the crew into eastern Greenland to study glaciers and ice caps while the team pursues large technical objectives. The program interweaves field science with climbing narrative, so her role is presented as research carried out in the context of long approaches, technical hauling and complex alpine route‑finding.

The single‑episode cut Alex Honnold Climbs a 4,000 Foot Sea Wall (Full Episode) | Arctic Ascent | National Geographic makes that dual purpose explicit: the expedition attempts a roughly 4,000‑foot sea wall on the Renland Ice Cap and Sevestre conducts on‑site measurements and observations about surrounding glaciers. For viewers, these films are valuable both for the climbing logistics — approaches, anchor building and hauling in polar conditions — and for seeing how scientific fieldwork is organized alongside a technical ascent. Together the episodes clarify the practical intersections between glaciological study and expedition climbing, showing how data collection and objective hazard management are integral to operating on remote polar faces.