Astrology.
Voldemort always wanted to teach Defence Against the Dark Arts but Dumbledore refused to give him a job. Voldemort then cursed the position so nobody could hold it for more than one year. In the 1991/1992 school year he shared Professor Quirrel's body. Quirrel taught Defence Against the Dark Arts.
Transfiguration was taught by Professor Albus Dumbledore. When he became headmaster he was replaced by Professor Minerva McGonagall.
Remus Lupin taught Defense Against the Dark Arts.
No. But he does teach herbology plenty (As James well knows!), and lives above a pub with Hannah Abbot. :D
Martial arts is not a subject taught at Hogwarts. Potions and Defence Against the Darks Arts are the two subjects Severus Snape taught. He taught Potions from 1981 - 1996 and Defence Against the Dark Arts from 1996 - 1997.
Severus Snape teaches Potions class.
In Order of the Phoenix, Professor Snape teaches Harry Occlumency and Harry's least favourite, Potions.
Astrology.
professor snape teaches potions but wants the dark arts job until he betrays Hogwarts
Voldemort always wanted to teach Defence Against the Dark Arts but Dumbledore refused to give him a job. Voldemort then cursed the position so nobody could hold it for more than one year. In the 1991/1992 school year he shared Professor Quirrel's body. Quirrel taught Defence Against the Dark Arts.
Severus Snape wanted to teach Defence Against the Dark Arts. However, Albus Dumbledore always refused to give him the position because he believed that it would result in him returning to Dark Arts so he was given the position of Potions teacher until 1996. In 1996, Dumbledore couldn't find a sufficient replacement for the position of Defence Against the Dark Arts teacher and was forced to give the place to Snape - whom he now trusted to remain on the correct side. Horace Slughorn became the potions master.
Albus Dumbledore wouldn't let Professor Snape teach Defence Against the Dark Arts because he was worried it would lead him back into his old ways. Dumbledore also know the position was curset so that nobody could hold the title for more than one year, and he needed Snape in the school.
Snape: I am Snape, the potions master. Welcome to potions class. Ron: Yay, potions! Harry: Hello, Snape! Hermione: What are we going to learn today, Professor? Snape: The beauty of the softly simmering cauldron with its shimmering fumes… Harry: Oh, not this again. Snape: ...the delicate power of liquids that creep through human veins… Ron: Eww! Snape: ...bewitching the mind and snaring the senses. Hermione: Ooh! Snape: I can teach you how to bottle fame… Harry: Don't need it. Snape: ...brew glory… Ron: Ooh la la! Snape: ...even put a stop onto death. Hermione: No, you can't. Snape: I can teach you the secrets of mystical fluids unknown. Harry: Okay. Snape: Enchanted juice, wizard liquids… Ron: Wow! Snape: ...the cool feminine curves of a potions flask… Hermione: Go on. Snape: ...the titillating scent of a fresh elixir. Harry: Is this the whole class? Snape: I can teach you how to pickle victory… Ron: Pickle victory! Snape: ...how to secrete success… Hermione: Oh, my! Snape: ...even score with hot babes. Harry: Wait, what? Snape: Class dismissed. (Ron and Hermione leave, but Harry stays) Harry: Wait, wait, hang on. Hot babes? Snape: Vamos, Mr. Potter. Harry: Teach me! Snape: No. Skidaddle. (Harry leaves) Dumbledore: Hello, Severus! Snape: Hello, headmaster. Dumbledore: I need to borrow some wizard liquids. Snape: I'm fresh out, sir. Dumbledore: How about enchanted juice? Snape: Nope. Dumbledore: How about expired Gorilla Milk? Snape: That has no magical properties, sir. Dumbledore: On contrast, Snape-a-doodle, it's done a wonder on me bowels! Snape: Okay, whatever, this way.
In the second book when Dumbledore has to leave for a while she steps up to the plate. Dumbledore comes back and is headmaster until he gets killed by Snape and again she becomes headmaster.
It is unknown, however he survived the Battle of Hogwarts and probably continued to teach there for many generations.
Hogwarts, Hogwarts, hoggy warty Hogwarts, Teach us something please, Whether we be old and bald, Or young with scabby knees, Our heads could do with filling, With some interesting stuff, For now they're bare and full of air, Dead flies and bits of fluff, So teach us things worth knowing, Bring back what we've forgot, Just do your best, we'll do the rest, And learn until our brains all rot.