Remus Lupin
Amycus Carrow, a Death Eater, is the Defence Against the Dark Arts teacher.
Gilderoy Lockhart was the Defence Against the Dark Arts teacher in Harry Potter and the Chamber of Secrets.
Dolores Umbridge.
Remus Lupin.
Severus Snape (the D.A.D.A. teacher in Harry Potter's 6th. year).
quiditch
In the seventh book subject Dark Arts is taught by Amycus Carrow.
Lord Voldemort placed on a curse on the position after he failed to get it.
Tom Riddle jinxed the position, because he was rejected as a teacher for this subject.
Remus Lupin, The Defence Against the Dark Arts teacher in The Prisoner of Azkaban
From the first year it self students at Hogwarts have The Defence Against The Dark Arts subject. The depth and difficulty increases year by year.
One, in Defence Against the Dark Arts because of the DA