Which Hogwarts professor is revealed to be Remus Lupin in J.K. Rowling’s Harry Potter series?

Remus Lupin is the Defence Against the Dark Arts professor introduced in Harry Potter and the Prisoner of Azkaban.

Lupin teaches at Hogwarts during Harry’s third year. He is widely regarded as one of the series’ most effective teachers because he gives students practical experience against dark creatures, including a lesson involving a boggart. His calm manner and knowledge make him a trusted adult for Harry and his friends.

The character’s major secret is that he is a werewolf. The full moon transforms him, and the condition contributes to his resignation after his identity becomes known. Rowling uses Lupin’s situation to explore prejudice and social exclusion within the wizarding world.

Lupin is also connected to Harry’s parents through the Marauders, the nickname used by James Potter, Sirius Black, Peter Pettigrew, and Lupin during their school years. That history makes him important beyond his teaching role.