Sultan Kösen (born 10 December 1982) is the tallest living person in Turkey. He is 8 feet 3 inches tall. He uses walking sticks. He has to have custom shoes made. He is the tallest verified living person in the world. He has the title the tallest man in the world. He has recieved Gamma Knife treatment on the gland which made him grow. He overtook Bao Xishun as the tallest man in the world and of the 12 people who have managed to grow to 8ft. Sultan Kösen was unable to complete his schooling because of his extreme height, but works occasionally as a farmer to support his family. Sultan Kösen has three brothers and a sister, who are all normal-sized, but his rate of growth surged from the age of 10 because of a tumour which caused too much growth hormone to be released from his pituitary gland. The tumour was successfully removed in surgery and he was thought to have stopped growing in 2008, but more recent measurements proved that he kept on growing for another 2 years.