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Sir Halford John Mackinder (15 February 1861 – 6 March 1947) was an English geographer, academic and politician, who is regarded as one of the founding fathers of both geopolitics and geostrategy. He was the first Principal of University Extension College, Reading (which became the University of Reading) from 1892 to 1903, and Director of the London School of Economics from 1903 to 1908. While continuing his academic career part-time, he was also the Member of Parliament for Glasgow Camlachie from 1910 to 1922. From 1923, he was Professor of Geography at the London School of Economics.

In 1904, Mackinder gave a paper on "The Geographical Pivot of History" at the Royal Geographical Society, in which he formulated the Heartland Theory. This is often considered as a, if not the, founding moment of geopolitics as a field of study, although Mackinder did not use the term. Whilst the Heartland Theory initially received little attention outside geography, this theory would later exercise some influence on the foreign policies of world powers.

The theory for Geographic Causation in Universal History proposed by Sir Halford Mackinder in his paper - The Geographic Pivot of History delivered as a lecture in 1904.

The theoretical propositions in the paper regarding how natural geography controls the flow of history of civilisations - with nature acting as a stage for man to act upon - was the most relevant contribution of Halford Mackinder towards developing a philosophic synthesis between geography, history and statesmanship, leading to the development of modern geopolitics.

Signs of Mackinder's Heartland Theory can be found in the works of geopolitician Dimitri Kitsikis, particularly in his "Intermediate Region" model. There is a significant geographical overlap between the Heartland or "Pivot Area" and the Intermediate Region, with the exception of Germany-Prussia and north-eastern China, which Kitsikis excludes from the Intermediate Region. Mackinder, on the other hand, excludes North Africa, Eastern Europe and the Middle East from the Heartland. The reason for this difference is that Mackinder's model is primarily geo-strategic, while Kitsikis' model is geo-civilizational. However, the roles of both the Intermediate Region and the Heartland are regarded by their respective authors as being pivotal in the shaping of world history.

The geographical pivot of history (1904)H J Mackinder (pdf) .

Cliodynamic Analysis of History: End Times (2023) ..