Question: who are the dada professors?
Answer: Albus Dumbledore (at least 1910s-1927)
Galatea Merrythought. (?-1945)
Patricia Rakepick (1988-1989)
Quirinus Quirrell (1991-1992)
Gilderoy Lockhart (1992-1993)
Remus Lupin (1993-1994)
Bartemius Crouch Jr (1994-1995)
Dolores Umbridge (1995-1996)