Work Permits
Any immigrant wanting to work in the United States must get a work permit (United States Employment Authorization Document, or EAD). These are granted on a temporary basis. Those with green cards do not need a work permit. They are only necessary for those people in the United States on a temporary basis and who hold temporary visas. An immigration lawyer can help you get a work permit if you need one.
There are two types of visas: H1B and H2B work permits. H1B is granted to those who want to work in the United States for a determined amount of time. They have skills valued by employers in the U.S. This requires an employer sponsor. An H2B work permit is granted to those who work seasonal or short-term jobs, and this is also employer-sponsored.