He most likely abandoned his Residency. How long ago did he leave the U.S.? And when was the last time that he came back?
And are you a U.S. Citizen over 21?
Ok, then he has abandoned his Residency. You would have to start a whole new process for him to get a new Residency status. Unfortunately, it will take about a year or so and there is no reasonable way to speed that up. Plus he most likely will not be able to visit during that time because they will not approve a visitor visa for him. Here is a link on how to do the process for him:
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