John B. Bury (16 October 1861 – 1 June 1927) was was an Irish historian, classical scholar, Medieval Roman historian and philologist. He objected to the label "Byzantinist" explicitly in the preface to the 1889 edition of his Later Roman Empire.
Bury's career shows his evolving thought process and his consideration of the discipline of history as a "science". From his inaugural lecture as Regius Professor of Modern History at Cambridge in 1902 comes his public proclamation of history as a "science" and not as a branch of "literature". He stated:
"I may remind you that history is not a branch of literature. The facts of history, like the facts of geology or astronomy, can supply material for literary art; for manifest reasons they lend themselves to artistic representation far more readily than those of the natural sciences; but to clothe the story of human society in a literary dress is no more the part of a historian as a historian, than it is the part of an astronomer as an astronomer to present in an artistic shape the story of the stars."
Since his time, research interests of historians changed, and there has been a shift away from traditional diplomatic, economic, and political history (history of facts) toward newer - more theoratical -approaches, especially social and cultural studies. The "cultural turn" of the 1980s and 1990s affected scholars in most areas of history. Inspired largely by anthropology, it turned away from leaders, ordinary people and famous events to look at the use of language and cultural symbols to represent the changing values of society
Despite the "old school" approach of "Byzantinists" such as J.B. Bury, Steven Runciman, Alexander Vasiliev, George Ostrogorsky, John Julius Norwich and even the 18th century Edward Gibbon, they taught us a not to be underestimated knowledge of the Eastern Roman Empire. They digged into the prime sources, they paid attention to anecdotes, they knew their ancient languages and offer us details we can't find anymore in recent (theoretical/analytical) historiography.
So if you want to study the history of the Late Antiquity, don't forget to read this generations - sometimes momumental - work.