 In 1971, he participated in the Research Seminar in Archaeology and Related Subjects at University of Sheffield.In 1979, Hopper wrote "Trade and Industry in Ancient Greece" which, along with his other books, has been cited several times.Hopper was a member of the Managing Committee of the British School of Archaeology at Athens and wrote two popular books on ancient Greek history, "The Acropolis" (1971) and "The Early Greeks" (1976).