Private art scholar and dealer of ancient Greek sculpture and portraits. Son of an affluent merchant in Mecklenburg, Arndt studied classical art with Johann Overbeck (q.v.) in Leipzig and Hermann Brunn (q.v.) in Munich. His dissertation, written under Brunn, focused on Greek vase types. He never attempted a habilitationschrift. Brunn took Arndt for his assistant. Because of his financial independence, Arndt could afford to remain a private scholar. Through his excellent library and nearly unfailing eye, Arndt developed a reputation for recognizing forgeries.