Jeffrey Parker

British historian at Ohio State who wrote The Military Revolution, The Grand Strategy of Philip II, and Global Crisis — one of the most influential historians of early modern Europe, known for the 'Military Revolution' thesis and his climate-history synthesis.

Proposed the Military Revolution thesis — that a cluster of tactical and organizational innovations in the 16th-17th centuries (firearms, drill, fortress design) required dramatically larger and more expensive armies, which in turn drove the development of the fiscal-military state.