I don't know a whole lot about US immigration but I believe you have to have a "green card" to work in the US. He can go to the US on a tourist visa but that is usually only for a set period of time. And then he would have to return home. A "green card" can be difficult to get. There are many specific exceptions. Usually the broad rule is that a foriegner can not get the right to work a job that a US citizen could just as well do. If an employer can prove that no US citizens can be found for a position they may be able to hire someone with those qualifications from abroad. Like a radio station that wanted a DJ with a British accent. Otherwise, there are few other exceptions. Getting the right to work is easier if you have bachelor's degree. Then you fall under different classifications. Employers can hired you without as much paperwork. The proplem is, that as soon as they let you go, fire you, or give you the boot; you either have to have another job with the same conditions or you leave the country. At any rate, if he wants to legally work in the US he will have to do something before he goes. Probably months before.