Hello how may I help you? I want to know who the tallest person in the world is Ok sure I can help you with that. Do you mean the tallest living person or the tallest person of all time? I want the tallest living person The tallest living person is Sultan Kosen who is an amazing 8 feet 3 inches tall! Wow he is tall. How tall was the tallest man of all time The tallest man in ever recorded history is Pershing Wadlow from the United States who was 8 feet tall 11 inches! He was from Alton, Illinois and born on February 22, 1918. Wow he was a lot taller and good information to know. Did both men suffer from hormonal issues? That is correct. Their growth resulted from the condition acromegaly, caused by a tumor affecting the pituitary gland. Very interesting stuff. Thanks. You are very welcome. Glad that I was able to assist you!