Question: who was the dada teacher in half blood prince
Answer: During the period the story takes place , the class is taught by Quirinus Quirrell ( book one ) , Gilderoy Lockhart ( book two ) , Remus Lupin ( book three ) , Bartemius Crouch Jr impersonating Alastor `` Mad - eye '' Moody ( book four ) , Dolores Umbridge ( book five ) , Severus Snape ( book six ) , and Amycus Carrow ( book seven ) .