He attended the Tatnall School of Wilmington, Delaware and later competed on the collegiate level at North Carolina State University.

He was hesitant to continue in track but decided to turn pro by signing a three-year deal with Adidas in 2018.

[7] Parsons competed in the 3000 m at the 2022 World Athletics Indoor Championships, finishing seventh in his qualifying heat, not advancing to the final.

In April 2022, Parsons became the first person to break 4 minutes in the mile on Delaware soil, running 3:58.17 on the track of his alma mater, Tatnall High School.

Later that summer, he competed at the 2022 European Athletics Championships, placing sixth over 5000 m.[9][10] In January 2023, Parsons ran a 5000 m personal best of 13:12.78 at Boston University, setting a German indoor record in the process.