How Tall Is Robert Wadlow?

At a height of 8 feet 11.1 inches, or 271.78cm tall, Robert Wadlow was the tallest man to have ever lived on record.
 
His abnormal height was a result of excessive amounts of growth hormone being released by his pituitary gland into his blood stream. Now that modern advancements in medicine exist, along with the early detection of growth problems, it's extremely unlikely that Robert Wadlow's height will ever be matched again.
 
He weighed 215kg and unfortunately died at the age of 22 due to an infection caused by braces attached to his leg.