Brigid Kosgei was born on 20 February 1994 in Kapsowar, in Kenya's Elgeyo-Marakwet County — the same Rift Valley highlands that have produced a generation of distance legends. Raised by a single mother alongside six siblings, she left school at 17 and began training with her then-boyfriend Matthew, who later became her husband. Unlike many elite runners, she bypassed the track entirely, building her game through European half-marathon circuits before committing to the full distance.
Her rise was rapid and relentless. She finished in the top two in eight of her first nine marathons, won back-to-back Chicago titles in 2018 and 2019, and in October 2019 shattered Paula Radcliffe's 16-year-old world record by 81 seconds with a 2:14:04 in Chicago — one of the most dominant performances in the history of the women's marathon. She added back-to-back London wins in 2019 and 2020, a Tokyo victory in 2022, and an Olympic silver medal in Tokyo — all before turning 30.
After a difficult stretch with injuries that kept her off major start lines through much of 2023 and 2024, she returned in 2025 with wins in Hamburg, Sydney, and Shanghai — where she broke the all-time course record. At 31, she remains one of the most formidable marathon runners on the planet.