 A life member of the Actors Studio, Horne was almost cast as Bud Stamper in "Splendor in the Grass" by director Elia Kazan, but the role eventually went to Warren Beatty.Around the same time, Horne was auditioned by Federico Fellini for the lead in "La Dolce Vita", which ultimately went to Marcello Mastroianni.In 1980, he appeared in a New York production of "Richard III".