Severus Snape
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She is a teacher at Hogwarts. The strict but passionate leader of Gryffindor, she is also the deputy head of Hogwarts and the Transfiguration teacher.
Transfiguration was taught by Professor Albus Dumbledore. When he became headmaster he was replaced by Professor Minerva McGonagall.
Sybill Trewanlyn.
Neville Longbottom became the Herbology teacher at Hogwarts.
In the Deathly Hallows, Severus Snape is Hogwarts headmaster. For the rest of the series it was Albus Dumbledore, and it is widely accepted that, after, Snape's death and the end of the War, Minerva McGonagall becomes headmistress in Snape's place.