From Wikipedia, the free encyclopedia. Alan Johnson (Ridley Park, PA) is an award winning choreographer, best known for his work on Mel Brooks films and for restaging Jerome Robbins original choreography in live productions of West Side Story in the United States and internationally. Johnson has been linked to West Side Story since making his Broadway debut in the show in 1957. Johnson brought the West Side Story dance style into the mainstream when he choreographed several Gap commercials in 2 ...