I spoke with the daycare Director and had what I feel was a very productive and open conversation. We have come up with an action plan:

The biter is formerly the baby of daycare. He is over a year old and therefore expected to become more independent. He doesn't like this and expressed himself through biting. The biting problem was brought under control by the use of a pacifier. Then they started to wean him off the pacifier.
This is when Keegan started at daycare.
The biter saw that there was a new baby and a baby who didn't have to be so independent. This is when he decided to express himself by biting. The other kids are taught to push a potential biter away and then get up. Keegan can not do either of these things. The biter marked him as a target. They try to place them apart by putting Keegan in a chair to play by himself when they aren't able to supervise closely (ie. diaper changes, meal prep). This is when the biter sneaks up and chomps on Keegan.
The initial plan was Keegan would be placed in the infant room therefore away from the biter. However because there currently aren't any other infants, they often combine rooms with the one year olds (the biter).
The new plan is that when rooms are combined, the biter will be bumped up to the next higher room. I checked and was assured that the biter will then not be placed at any risk of physical harm by older children. The parents of the biter are also aware and have now reinstated the pacifier intervention.
Eventually Keegan will age into the biter's classroom. We will reassess the plan at that point.
Right now Keegan is a very sweet and cuddly little guy. One day he might be the biter. I hope not. But for now I want to keep him safe until he atleast learns to protect himself.