In 1887, he published "On the Scope and Methods of Geography", a manifesto for the New Geography.
A few months later, he was appointed Reader in Geography at the University of Oxford, where he introduced the teaching of the subject.
As Mackinder himself put it, "a platform has been given to a geographer".
This was arguably at the time the most prestigious academic position for a British geographer.

In 1892, he was the first Principal of University Extension College, Reading, a role he retained until he was succeeded, in 1903, by William Macbride Childs.
The college became the University of Reading in 1926, a progression that owed no small debt to his early stewardship of the institution.

In 1893, he was one of the founders of the Geographical Association, which promotes the teaching of geography in schools.
He later became chairman of the GA from 1913 to 1946 and served as its President from 1916–17.

In 1895, he was one of the founders of the London School of Economics.
At Oxford, Mackinder was the driving force behind the creation of a School of Geography in 1899.
In the same year, he led an expedition of the first Europeans to climb Mount Kenya.
It was during this expedition that eight of his African porters were killed; it is disputed as to who killed them, as both Mackinder and another man, Edward Saunders were recorded issuing death threats.
 
In 1902, he published Britain and the British Seas, which included the first comprehensive geomorphology of the British Isles and which became a classic in regional geography.

He was a member of the Coefficients dining club, set up in 1902 by the Fabian campaigners Sidney and Beatrice Webb, which brought together social reformers and advocates of national efficiency.

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.

Possibly disappointed at not getting a full chair, Mackinder left Oxford and became director of the London School of Economics in the same year.
After 1908, he concentrated on advocating the cause of imperial unity and lectured only part-time.
He stood unsuccessfully as a Liberal Unionist in a by-election for Hawick Burghs in 1909.
He was elected to Parliament in January 1910 as Liberal Unionist member for the Glasgow Camlachie constituency and was defeated in 1922 as a Unionist.
He was knighted in the 1920 New Year Honours for his services as an MP.

His next major work, Democratic Ideals and Reality: A Study in the Politics of Reconstruction, appeared in 1919.
It followed the 1904 book  titled The Geographic Pivot of the History, and presented his theory of the Heartland and made a case for fully taking into account geopolitical factors at the Paris Peace conference and contrasted (geographical) reality with Woodrow Wilson's idealism.
The book's most famous quote was: "Who rules East Europe commands the Heartland; Who rules the Heartland commands the World Island; Who rules the World Island commands the World."
This message was composed to convince the world statesmen at the Paris Peace conference of the crucial importance of Eastern Europe as the strategic route to the Heartland was interpreted as requiring a strip of buffer states to separate Germany and Russia.
These were created by the peace negotiators but proved to be ineffective bulwarks in 1939 (although this may be seen as a failure of other, later statesmen during the interbellum).
The principal concern of his work was to warn of the possibility of another major war (a warning also given by economist John Maynard Keynes).

Mackinder was anti-Bolshevik, and as British High Commissioner in Southern Russia in late 1919 and early 1920, during the Russian Civil War, he stressed the need for Britain to continu
In 1887, he published "On the Scope and Methods of Geography", a manifesto for the New Geography. A few months later, he was appointed Reader in Geography at the University of Oxford, where he introduced the teaching of the subject. As Mackinder himself put it, "a platform has been given to a geographer". This was arguably at the time the most prestigious academic position for a British geographer.
In 1892, he was the first Principal of University Extension College, Reading, a role he retained until he was succeeded, in 1903, by William Macbride Childs. The college became the University of Reading in 1926, a progression that owed no small debt to his early stewardship of the institution.
In 1893, he was one of the founders of the Geographical Association, which promotes the teaching of geography in schools. He later became chairman of the GA from 1913 to 1946 and served as its President from 1916–17.
In 1895, he was one of the founders of the London School of Economics. At Oxford, Mackinder was the driving force behind the creation of a School of Geography in 1899. In the same year, he led an expedition of the first Europeans to climb Mount Kenya. It was during this expedition that eight of his African porters were killed; it is disputed as to who killed them, as both Mackinder and another man, Edward Saunders were recorded issuing death threats.  
In 1902, he published Britain and the British Seas, which included the first comprehensive geomorphology of the British Isles and which became a classic in regional geography.
He was a member of the Coefficients dining club, set up in 1902 by the Fabian campaigners Sidney and Beatrice Webb, which brought together social reformers and advocates of national efficiency.
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.
Possibly disappointed at not getting a full chair, Mackinder left Oxford and became director of the London School of Economics in the same year. After 1908, he concentrated on advocating the cause of imperial unity and lectured only part-time. He stood unsuccessfully as a Liberal Unionist in a by-election for Hawick Burghs in 1909. He was elected to Parliament in January 1910 as Liberal Unionist member for the Glasgow Camlachie constituency and was defeated in 1922 as a Unionist. He was knighted in the 1920 New Year Honours for his services as an MP.
His next major work, Democratic Ideals and Reality: A Study in the Politics of Reconstruction, appeared in 1919. It followed the 1904 book  titled The Geographic Pivot of the History, and presented his theory of the Heartland and made a case for fully taking into account geopolitical factors at the Paris Peace conference and contrasted (geographical) reality with Woodrow Wilson's idealism. The book's most famous quote was: "Who rules East Europe commands the Heartland; Who rules the Heartland commands the World Island; Who rules the World Island commands the World." This message was composed to convince the world statesmen at the Paris Peace conference of the crucial importance of Eastern Europe as the strategic route to the Heartland was interpreted as requiring a strip of buffer states to separate Germany and Russia. These were created by the peace negotiators but proved to be ineffective bulwarks in 1939 (although this may be seen as a failure of other, later statesmen during the interbellum). The principal concern of his work was to warn of the possibility of another major war (a warning also given by economist John Maynard Keynes).
Mackinder was anti-Bolshevik, and as British High Commissioner in Southern Russia in late 1919 and early 1920, during the Russian Civil War, he stressed the need for Britain to continu
Halford Mackinder