Chris Mosier is an American advocate for transgender rights and a competitive triathlete, duathlete, and racewalker. He began his athletic career before transitioning, starting his transition in 2010. In 2015, Mosier earned a spot on the Team USA sprint duathlon men's team for the 2016 World Championship in the men's 35-39 age group division, making him the first known out trans athlete to join a U.
S. national team different from his sex at birth.