As of November 2014, the tallest man in the world is Sultan Kösen, at 8 feet 3 inches tall. Kösen’s extreme height is due to an overproduction of growth hormones caused by a tumor pressing on his pituitary gland.
Born in Turkey in 1982 to parents of normal height, Kösen began growing uncontrollably at the age of 10. In 2010, he underwent surgery on the tumor, which stopped his body’s overproduction of growth hormones, halting his incredible growth. Kösen also holds the world record for the largest hands on a living person and previously held the record for the world’s largest feet. In November of 2014, Kösen traveled to London for Guinness World Records Day, where he met Chandra Bahadur Dangi, who, at 1 foot 7 inches, is the world’s smallest man.