Hopper was the Senior Lecturer in charge of the Department of Ancient History at the University of Sheffield in Sheffield, England from 1947 to 1956.[3] From 1967 to 1970, he was Dean of the Faculty of Arts at Sheffield and, by 1976, was a Professor Emeritus.[4]
In 1953, he wrote the book The Attic Silver Mines in the 4th Century BC.[5] In 1955, he wrote the book Ancient Corinth about Corinth's history.[6] In 1961, he wrote the book The Mines and Miners of Ancient Athens, and in 1963 he wrote both Parthenos and Parthenon[7] and Greece and Rome.[8] In 1964 he reviewed The Growth of the Athenian Economy by A. French.[6] In 1968 Hopper wrote a book about the Laurium mines, titled The Laurium Mines: A Reconsideration[9] and, that same year, wrote the segment "Observations on the Wappenmünzen" in the book Essays in Greek Coinage by C. M. Kraay and G. K. Jenkins.[10][11] In 1971, he participated in the Research Seminar in Archaeology and Related Subjects at University of Sheffield.[12] In 1979, Hopper wrote Trade and Industry in Ancient Greece which, along with his other books, has been cited several times.[13][14][15][16]
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)[14] and The Early Greeks (1976).[17]