He performed as a child in George Balanchine's original production of "The Nutcracker" as the Nutcracker Prince; and later with the companies of Mary Anthony, Pearl Lang, and Sophie Maslow. At sixteen he appeared on Broadway in "West Side Story" and was cast as Baby John in the movie version of the musical; during the filming of "Cool" (one of the hardest dances in the film), Feld was sick with pneumonia. His other Broadway credits from this period include "I Can Get It for You Wholesale" and "Fiddler on the Roof".