Henry is a British distance runner competing for Oklahoma State University in NCAA Division I athletics. Versatile across track and cross country, he has progressed from national junior champion to international competitor, with personal bests spanning 1500m to 5000m.

Henry enjoyed a breakthrough 2022 season, winning the English Schools and SIAB Schools International 1500m titles, alongside the English U17 National Championships 3000m title, where he broke a 42-year-old championship record. In 2023, he claimed the U17 National Cross Country Championships title before finishing sixth at the European Athletics U20 Cross Country Championships.

In 2024, Henry represented Great Britain at the World Athletics U20 Championships in the 3000m and secured silver in the U20 5000m at the England Senior and U20 Championships.

Since moving to the United States, Henry has continued to develop over longer distances. In 2025, he ran a 5000m personal best of 13:36.29 and qualified for the NCAA West Preliminary Championships. He continued his progress in 2026, setting an indoor 3000m personal best of 7:52.52 and earning All-Big 12 honours in the distance medley relay.