As of May 2020, Gregorek holds the world record for the fastest Blue Jean Mile, ran in a time of 4:06.25.

[4] He earned a degree from Columbia University in 2014,[5] then, taking advantage of an NCAA rule which allows athletes to transfer to another school for a fifth year of competition, joined the Oregon Ducks.

Gregorek ran the Blue Jean Mile wearing 100% cotton Levi's, while raising over $37,500 for the National Alliance on Mental Illness (NAMI).

He ran the mile in memory of his younger brother Patrick, who died suddenly in March 2019 after struggling with mental health.

[3] His mother, Christine Mullen,[13] was an Olympic trials finalist[14] and competed in the 1980s for Athletics West in Eugene, Oregon.