Professor Quirinus Quirrell (26 September, 1970 or earlier – 4 June, 1992) was a half-blood wizard who attended Hogwarts School of Witchcraft and Wizardry and was Sorted into Ravenclaw House. He was the Muggle Studies professor at Hogwarts, though he later became the Defence Against the Dark Arts professor during the 1991–1992 school year.