Miles got her start in showbiz riding horses as they plunged from a 40-foot-high platform into a pool of water, in Atlantic City N.J. from 1958 to 1966. She later worked as a rodeo stunt rider, gymnast, actress, stylist, and Playboy Bunny. She has modeled in commercials for major brands like Benson-Hedges cigarettes and Coca-Cola. She has also performed stunts for television, movies, and on Broadway. But as a stuntwoman, she's best known for her work in The Exorcist as the demon-possessed child Regan's scary, upside-down, head-first attack down a staircase.