Gamekeeper and Keeper of the Keys at Hogwarts, in the fall of 1993 he also became the Care of Magical Creatures teacher. 

• Facts in brief
• Hagrid's accent
• Timeline
• Hagrid's pockets

Hagrid attended Hogwarts, starting in 1940. When he was a student there, he was falsely accused by Tom Riddle of opening the Chamber of Secrets and releasing a monster. Hagrid was expelled. Albus Dumbledore, then the Transfiguration Teacher at Hogwarts, arranged for him to stay on as gamekeeper. In 1993, his name was cleared through the efforts of Harry Potter and his friends.

Hagrid was not allowed to do magic before his name was cleared, although it seems that his broken wand was somehow imbedded in his pink umbrella and he did cast a spell or two. Now he is allowed to do magic, but as he was never properly trained, he'll always be somewhat inept at it (SN).

Hagrid, Rubeus
hair: long, wild tangled black hair and beard
eyes: glinting like black beetles, crinkled in a smile (SS4)
distinguishing feature: he gives the impression of being "too big to be allowed"
House: Gryffindor (BN)
field: Care of Magical Creatures
title: Keeper of the Keys and Grounds (SS4)
home: one-room wooden hut on the grounds, near the Forbidden Forest
interests: magical creatures, the more dangerous the better, drinking, dragons
born: 1929, human father and giant mother
pet: Fang, the boarhound (in 1942: Aragog, an Acromantula)

Hagrid's Accent
Neil Ward

It's hard to pin it down to the use of individual words with any level of certainty. For example, "summat" is often associated with a Yorkshire accent, but could equally be associated with a West Country accent, I think, when combined with contractions like "dunno" and "gotta".

I'd say dropping the 't' in something like "Righ' then" (for "Right then") or "Beau'iful" (for "Beautiful") or "don'" (for "don't") - especially at the end of words - favours West Country over Yorkshire, as the former accent tends to skim some of those hard consonants, whereas the latter would often sound them. I also think a Yorkshire accent might feature more unusual words rather than just recognisable words with an accent (e.g. "Nowt" rather than "Nothin'").

I don't know if it's significant that Robbie Coltrane plays Hagrid in the movies with a West Country accent. He's Scottish, but has used a West Country accent in other acting roles, so it may just be the only English accent he feels he can carry off.  On the other hand, the books don't contradict that choice of accent.

It's fairly easy to exclude other strong accents, such as Cockney, Scottish etc. I'd go for West Country, and not be more specific than that, but that's just my opinion, of course!
 

timeline
1929 born to giant mother, Fridwulfa, and a human father
1932 Fridwulfa abandons her family
1940 starts Hogwarts
1942 father dies
1943 falsely accused of opening the Chamber of Secrets, expelled and given gamekeeper position
1981 rescues baby Harry from ruins of his parents' house, delivers Harry to Privet Drive
July 31, 1991 takes Harry to buy his things for Hogwarts
spring 1992 hatches a baby Norwegian Ridgeback dragon
May, 1993 sent to Azkaban for a few weeks
June 1993 name cleared after fifty years
fall, 1993 given the job of Care of Magical Creatures teacher
October 30, 1994 meets Olympe Maxime
summer 1995 visits the giants of the north

Hagrid's pockets
Hagrid commonly wears a huge moleskin overcoat with many pockets. In these pockets one finds an amazing assortment of odds and ends:

• dormice
• birthday cake
• owl
• quill and parchment
• dog biscuits (moldy)
• letter to Harry from Hogwarts
• copper kettle
• squashy package of sausages
• poker
• teapot
• several chipped mugs
• bottle of amber liquid
• pink umbrella
• coins
• bunches of keys
• slug pellets
• balls of string
• peppermint humbugs
• tea bags
• letter from Dumbledore to Gringotts re: vault 713
• key to Harry's vault

NOTES ON THE NAME:

Regardless of what you may have read online, the name "Hagrid" does not come from Greek mythology. There is a persistent rumor floating around to that effect, but it is false. Milz, in response to a question about this rumor on HPfGU, writes:

I read that on several HP sites. Like you I thought I was missing something in spite of having read numerous Greek mythology books (Hamilton, Bullfinch, etc.) as a child. I even looked it up in a "who's who" book of mythological characters. The result: nothing. 

I assume this is "hagrid" name information is make believe.

Quite by accident, I DID find something interesting in Thomas Hardy's novel, Mayor of Casterbridge. The paragraph mentions "country" (obsolete) expressions and their more dignified equivalents in late 18th century England. "Dumbledores", according to Hardy, are "humblebees" (now more commonly known as "bumblebees"). "Hagrid" was gastrointestinal upset, ie, indigestion. (In light of Hagrid's culinary skills, rock-hard rock cakes and a talon in beef casserole, it makes some sense.)

Between Thomas Hardy and these HP websites, I'd believe Hardy.;-)

Here's a transcript of the false story:

Hagrid - Name and tale comes from greek myth. The ancient Hagrid from the myth was the god of Jewels. This god was said to be the kindest of the gods, but Hades framed him for the death of Piraeus's (the killer of Medusa) son. Hagrid was banished from Olympus but Zues allowed him to stay as the watcher of the animals.