Biography: Nicholas Dylan Harrison Efron is a producer, reality star, and media personality who started his career behind the scenes on films like A Star Is Born and American Sniper. He also worked as a stuntman. Efron is the younger brother of actor Zac Efron and produced his brother's Daytime Emmy-winning travel show, Down to Earth with Zac Efron, even appearing in a few episodes. He's also known for hosting Flow State, a series that documents extreme physical challenges.