It was primarily his skill as a portrait painter that gained Zorn international acclaim based principally upon his incisive ability to depict the individual character of his model. His subjects included three American Presidents, one of whom was Grover Cleveland in 1899, as well as his wife, along with William H. Taft and Theodore Roosevelt. At 29, he was made a Chevalier de la Légion d'honneur at the Exposition Universelle 1889 Paris World Fair.