Harrison began developing his movement style as a tumbling specialist and later as a dancer in Broadway theatre productions. In 1990, he established the performance company AntiGravity, composed of athletes, acrobats, and former Olympic competitors, with Harrison serving as director. They have been involved in various projects, including original theatrical productions, corporate events, and choreographing live performances, including the 2008 Neighborhood Inaugural Ball and the closing ceremonies of the 2002 Winter Olympics. AntiGravity has also collaborated with musicians and pop celebrities for performances in entertainment industry shows, including the Academy Awards, the MTV Video Music Awards, and the Grammys. Harrison continues to work as an aerial designer for Broadway shows and the Metropolitan Opera.