What school subject does Remus Lupin teach when he first appears in J.K. Rowling’s Harry Potter series?

Remus Lupin teaches Defence Against the Dark Arts when he first appears in J.K. Rowling’s Harry Potter series. He becomes the subject’s professor at Hogwarts during Harry’s third year, in Harry Potter and the Prisoner of Azkaban.

Lupin is widely regarded by Harry and his classmates as one of the subject’s best teachers. He gives practical lessons on creatures and defensive magic, including a memorable exercise involving a Boggart. His calm approach contrasts with the dangerous or ineffective teachers who hold the post in other years.

Lupin’s tenure ends after Severus Snape reveals that Lupin is a werewolf. Although Lupin takes precautions and poses no deliberate threat to students, he resigns after the information becomes public. The position’s repeated turnover is a running feature of the series, linked to Voldemort’s failed attempts to control the post.