Rubeus Hagrid, a half-giant nearly 12 feet (3.7 m) tall, with tangled black hair and beard, was expelled from Hogwarts and his wand was broken, but Professor Dumbledore let him stay on as the school's gamekeeper, a job which enables him to lavish affection and pet names on even the most dangerous of magical creatures. Hagrid is fiercely loyal to Dumbledore and quickly becomes a close friend of Harry, Ron and, later, Hermione, but his carelessness makes him unreliable. Professor Dumbledore, a tall, thin man who wears half-moon spectacles and has silver hair and a beard that tucks into his belt, is the headmaster of Hogwarts, and thought to be the only wizard Voldemort fears.