Employment Law Questions? Ask an Employment Lawyer.
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Generally speaking, an employer would not be responsible for the criminal acts of one of its employees. The employee that assaulted you acted on his own, outside the scope of employment. The exception is if you had made complaints about this employee or asked to not work with him, and the employer failed to act. In that case, they could be responsible. If the employee was on parole for a similar violent act, and he was put in a position where this would be likely to occur... you might be able to make a claim out, but it would be somewhat tenuous.
That said, you will have a worker's compensation case. You sustained injuries on the job, and your employer is responsible for that, regardless of fault. And of course, you can sue the employee himself.