Horn earned his BFA in sculpture from the Philadelphia College of Art and his MFA from Queens College. He also studied drawing at studio Simi in Florence and completed an apprenticeship at Henreau Marble Studios in Carrara, Italy. He has taught sculpture and drawing at Queens College and techniques of stone carving and restoration at Trinity College in Rome, Italy. In addition to teaching, he has worked on numerous sculpture commissions, on several major historical
Conservation projects in Italy under the aegis of the Soprintendenza di Belle Arti of Rome, including the Arch of Constantine, and on cast collections at the Metropolitan Museum of Art in New York, the Capitolini Museum and the Roman Forum in Rome, Italy, the Kunstmuseum in Bonn, Germany, and the New York Academy of Art.