Alex grew up in the Mt. Elgon District of Kenya–a rural part of the country before eventually moving with his family to Trans-Nzoia in the Rift Valley. He comes from a family of professional distance runners. His brother Moses was a two-time Olympian. His sister Linet was an Olympic Bronze Medalist and a World Championship Gold Medalist, and his sister Maggie is a 2:22 marathoner. Alex chose to play other sports in high school, including team handball, before deciding to move to the United States for college on a running scholarship.
Alex joined HOKA NAZ Elite in August of 2021. He will begin his professional career in the fall.
Alex attended Hofstra University in New York, where he majored in Criminology. After not running much in high school, it took a while before his talent began to produce high level results. In 2020, he ran 7:53.04 for 3,000 meters, 13:28.55 for 5,000 meters and 28:11.05 for 10,000 meters. That was all a precursor to 2021 where he finally reached the top of the NCAA–finishing sixth and tenth in the 10,000 and 5,000 at the NCAA Outdoor Championships in personal bests of 27:45.19 and 13:24.68.