who is the tallest person in the world?

best answer
According to the Guinness Book Of World Records the tallest human in recorded history was Robert Wadlow of the United States (1918–1940) who was 272 cm (8 ft 11 in). He received media attention in 1939 when he was measured to be the tallest man in the world beating John Rogan s record after reaching a height of 267 cm (8 ft 9 in).