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Scullard's father was Herbert Hayes Scullard, a minister, and his mother Barbara Louisa Dodds.
Born in Bedford, England, his early education was at Highgate School, followed by St. John's College, Cambridge. He was a tutor and then reader at New College London, from 1935 to 1959, when he became Professor of Ancient History at King's College London, retiring in 1970. He nonetheless remained active in retirement and notably wrote chapters for the re-edition of The Cambridge Ancient History, but his contributions to volumes VII and VIII were published posthumously.
Perhaps his most widely known work is From the Gracchi to Nero: A History of Rome from 133 B.C. to A.D. 68, a text widely used by students studying Rome in the late republic, as well as Rome under the Julio-Claudians.
- Scipio Africanus in the Second Punic War, Cambridge: Cambridge University Press, 1930, a Thirlwall Prize essay.
- A History of the Roman World from 753 to 146 BC, London: Methuen, 1935, reprinted.
- Roman Politics 220-150 B.C., Oxford: Clarendon Press, 1951.
- From the Gracchi to Nero: A History of Rome from 133 B.C. to A.D. 68, London: Methuen, 1959, reprinted.
- Shorter Atlas of the Classical World, Edinburgh: Thomas Nelson & Sons, 1962.
- The Etruscan Cities and Rome, London: Thames & Hudson, 1967.
- Scipio Africanus: Soldier and Politician, London: Thames & Hudson, 1970.
- The Elephant in the Greek and Roman World, London: Thames & Hudson, 1974.
- Roman Britain: Outpost of the Empire, London: Thames & Hudson, 1979.
- Festivals and Ceremonies of the Roman Republic, London: Thames & Hudson, 1981.
- Livy, History of Rome, Book XXX, London: Metheun, 1939, with H.E. Butler
- Atlas of the Classical World, London: Nelson, 1959.
- The Grandeur That Was Rome, London: Sidgwick & Jackson, 1961.
- Oxford Classical Dictionary, Oxford: Clarendon Press, 1970, with N.G.L. Hammond.
- Cary, Max, A History of Rome Down to the Reign of Constantine (3rd ed.), London: Macmillan, 1975, the 1st edition having come out in 1935.
- "Scullard, Herbert Hayes (SCLT885HH)". A Cambridge Alumni Database. University of Cambridge.
- A. E. Astin & F. W. Walbank, Cambridge Ancient History, vol. VII, Rome and the Mediterranean to 133 B.C., Cambridge University Press, 1989, p. xvi.
- Necrology by F.W. Walbank in Proceedings of the British Academy 69, 595-610.