Amycus Carrow's successor

This person was a witch or wizard and professor of the Defense Against the Dark Arts  at Hogwarts School of Witchcraft and Wizardry.

In his class, from time to time, Harry Potter is give some talks on the subject.

Behind the scenes
With the death of Voldemort, the post of professor or Defense Against the Dark Arts isn't longer cursed, and a professor gets to be more than a year in office.