He was Potions Professor for over fifty years and Head of Slytherin before retiring in 1981.
Slughorn is a new Hogwarts professor in "Half-Blood Prince".
Horace
He plays professor slughorn
Rubeus Hagrid was in Gryffindor at Hogwarts School of Witchcraft and Wizardry. Hagrid was in the Gryffindor house.
it was never mentioned but it could be a baby dragon
Professor Horace Slughorn takes over the position of potions master. Professor Severus Snape becomes the Defence Against the Dark Arts teacher. The following year, Slughorn becomes the Head of Slytherin house after Snape becomes Headmaster.
Horace, Horace Slughorn.
Retired. Before his retirement he was also a Hogwarts professor.
Venemous Tentacular.
The new Potions teacher is Professor Slughorn
Books 1-5 was professor Snape, book 6-7 was Horace Slughorn.
Gryffindor: Professer McGonagall Hufflepuff: Professer Sprout Ravenclaw: Professer Flitwick Slytherin: 1-6 Professer Snape 7 Professer Slughorn ( He was head of house for Slytherin in the 6th book in the few hours after Snape left the castle).