Question: Zbigniew Brzezinski belonged to the realist school who followed in the geo political relations of what geopolitics and strategy founding father? 
Sentence (from "Halford Mackinder"): Sir Halford John Mackinder PC (15 February 1861 – 6 March 1947) was an English geographer, academic, politician, the first Principal of University Extension College, Reading (which became the University of Reading) and Director of the London School of Economics, who is regarded as one of the founding fathers of both geopolitics and geostrategy.
Relevant evidence: Yes