my oldest was a biter and now my 2 year old is doing it too. The best thing that the provider can do it try to catch him before he bites, i know it is hard and my little girl will bite anyone so I have problems catching her before.
With my daughter i started by just telling her that that hurt the other child and showing her the mark but she has gotten worse lately so I have started boping her on the mouth when she bites and telling her no biting. I don't hit her hard just enough to focus her attention and get a reaction.
My son was very stubborn and we actually ended up using a small drop of vinegar on his tongue when he bit. We would let it sit for a moment and then give him a drink of milk to neutalize the vinegar, that worked well but he was closer to 3 at the time.
Basicaly what ever method you guys pick you just have to be very consistant and make sure he and the other child are watched to help prevent it from happening.