Sir Halford John Mackinder was a British 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 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 Conservative and Unionist Member of Parliament for Glasgow Camlachie from 1910 to 1922. From 1923, he was Professor of Geography at the London School of Economics.

A geographer is a physical scientist, social scientist or humanist whose area of study is geography, the study of Earth's natural environment and human society, including how society and nature interacts. The Greek prefix "geo" means "earth" and the Greek suffix, "graphy", meaning "description", so a geographer is someone who studies the earth. The word "geography" is a Middle French word that is believed to have been first used in 1540.