Question: What is the name of the actor who played the role of the person who is Keeper of Keys and Grounds of Hogwarts in "Harry Potter" films? 
Sentence (from "Rubeus Hagrid"): He is introduced in "Harry Potter and the Philosophers Stone" as a half-giant and half-human who is the gamekeeper and Keeper of Keys and Grounds of Hogwarts, the primary setting for the first six novels.
Relevant evidence: Yes