Hello how may I help you? Can you tell me who the tallest person in the world is? Yes, searching... Do you mean the tallest living person or the tallest person of all time? Okay. I mean tallest ever Ok, The tallest person ever was John Cmore How tall was he? John Cmore was 7'11" Okay and who was the shortest person ever? The shortest person ever was He Pingping And how tall was he? He was 2'9" Thanks for the info