A student at the
University of Oregon Johnson is studying for a master's degree in sociology. At high school she was on the debate team and was named the Texas Gatorade Track & Field Girls Athlete of the Year award as a high school junior in 2013. Johnson was the runner up in the 60 m hurdles at the
2022 USA Indoor Track and Field Championships behind
Gabbi Cunningham. Johnson was also runner up in the 100 m hurdles at the
2022 USA Outdoor Track and Field Championships, this time behind
Kendra Harrison with Johnson running a personal best of 12.35 seconds. That time of 12.35 placed Johnson twelfth on the all time 100 metres hurdles list, worldwide. Consequent from this performance Johnson was selected for the American team to take part in the
2022 World Athletics Championships held in
Eugene, Oregon. Unfortunately for Johnson, the 100 metre hurdle event did not go well for her as she was one of a number of athletes to crash out and be disqualified, including her compatriot and the defending world champion,
Nia Ali. She finished as runner-up in the 100 m hurdles at the LA Grand Prix in May 2024. The following month, finished second at the
US Olympic Trials in a personal best time of 12.31 seconds to earn a place on the US team for the 2024 Paris Olympics. She subsequently competed in the 100 m hurdles at the
2024 Paris Olympics, reaching the final, where she placed seventh overall. Johnson competed in the
2025 Diamond League event at the
2025 Meeting de Paris in June 2025. On 2 August, she placed third in the final of the 100 metres hurdles at the
2025 USA Outdoor Track and Field Championships. She was a semi-finalist at the
2025 World Athletics Championships in
Tokyo, Japan. Johnson opened her 2026 indoor season competing in Europe, her performances including running 7.88 for the 60 metres hurdles at the Czech Golden Gala in Ostrava, and 7.85 at the Copernicus Cup in Toruń.{{Cite web |title= History repeats as Crestan and Molnar headline record spree in Ostrava|date=3 February 2026 ==Statistics==