Well the best thing for him to do is go to the closest US consulate and apply for a visitors visa, it would be best for you to send him a letter. The letter should be addressed to the consulate and state that your going to pay all his living expenses during his stay in the US, this is generally a good idea for long stay visitors as the consulate and US immigration will want to see that he will have his expenses covered and won't be working illegally.
Getting the visa should be quite easy if he has not tried to enter illegally in the past.
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