Mary Cain is currently an M2 at Stanford University School of Medicine. She also serves as an Athletes Network for Safer Sports Advisory Council Member at the Sport & Rights Alliance, a position she has held since 2023.

Previously, Cain was a professional runner for USA Track & Field from November 2013 to May 2021. Concurrently, she worked as a Digital Products Specialist at New York Road Runners on a part-time basis from February 2020 to June 2024.