Professor Remus John Lupin (March 10, 1960 - May 2, 1998), also known as Moony, was a half-blood wizard, son of Mr. and Mrs. Lupin, and later became a werewolf from being bitten by the werewolf Fenrir Greyback after his father insulted Greyback - thus becoming a werewolf himself.
He attended Hogwarts School of Witchcraft and Wizardry and was sorted into Gryffindor house. During his school years, he was one of the Marauders; he was the closest of friends with fellow Gryffindors; James Potter, Sirius Black, and Peter Pettigrew. Together, they created the Marauder's Map. Whilst Lupin attended Hogwarts as a student, the Shrieking Shack and Whomping Willow located near Hogsmeade were created by Albus Dumbledore during Lupin’s first year to protect him on the nights that he would transform into a werewolf.
Professor Lupin was the professor for Defence Against the Dark Arts at Hogwarts during the 1993-1994 school year and was known all throughout the school as a big favourite to all students. He replaced Gilderoy Lockhart in the position, and his office was located on the 2nd floor of the Hogwarts castle. Even though the student's were unaware of his condition, the Hogwart's staff were told that Lupin was a werewolf.