Sungil Cho replied 15th Oct '14:
First I would recommend trying to develop both sides to learn to collaborate with each other. It's worth trying, because the value is great. However, this often does not work, only to exacerbate the situation. People don't change easily.
In that case, the second attempt would be supporting both sides to maintain a certain distance and toleration, avoiding to hurt each other, and focus on their own works.
This still may not work. Even a look at each other might cause excruciating agony.
Then the final decision would be moving the disliked person to a position where he or she can work alone, but become more productive. This will make both sides happy.
If unfortunately such a position is not available in your company, the last resort would be advising the disliked person to leave for a new job. It is important to spare enough time and resources to make this transition as smooth as possible. With some luck, the person may eventually find a spot where he or she can win a Nobel prize.