Theodore Klein

About

Theodore Klein is a French mountain runner and short-trail specialist who has broken into the global elite through consistent performances at international championship events. He placed 22nd at the 2025 World Mountain and Trail Running Championships classic 14K, competing alongside the world's best at one of the deepest men's fields in the event's history. He has built his UTMB Index through a series of strong performances at French and European mountain running races. Relatively young on the international scene, Klein represents the next generation of French talent in short-format trail and mountain running — a generation that complements the country's dominant ultra tradition with increasingly competitive depth in shorter formats.