Who is the Potions Master at Hogwarts (in the first book)?

Severus Snape is the Potions Master at Hogwarts in Harry Potter and the Sorcerer’s (Philosopher’s) Stone, teaching first-years how to brew draughts and also serving as Head of Slytherin House. Minerva McGonagall teaches Transfiguration, Filius Flitwick teaches Charms, and Horace Slughorn doesn’t return as Potions Master until book six. Snape’s mastery of subtle, precise magic matches potions’ meticulous nature, and his intimidating classroom sets the tone for Harry’s early school days. Memory tip: think “Slytherin Snape stews in cauldrons”—the S’s link Severus, Slytherin, and stewing potions.