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ANSWER: A lawyer cannot do anything that the law does not allow him to do for himself. moreover, he cannot get his visitor visa "reinstated"; instead, he would have to re-apply for a visitor visa from scratch. and overcome his previous immigration violation.
Note that because he was unlawfully present in the US for more than 1 year, he is subject to a 10-year ban from re-entering the US as an immigrant, unless he can get a hardship waiver (I-601) approved.
However, as he is seeking a non-immigrant visitor visa, he can request a Hranka Waiver. If approved, he can still apply and be approved for a visitor visa to come back. Note that if they know he is your fiance, it is highly unlikely that he will be issued the visitor visa.
It would be a good idea to get an attorney to help him, but here is information on the Hranka Waiver: http://www.nolo.com/legal-encyclopedia/applying-nonimmigrant-visa-hranka-waiver.html
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