01
Work — temporary status
Several categories let foreign specialists work in the United States. Some are temporary; a later, separate employment-based process may lead toward a Green Card. H-1B itself is not a Green Card.
- H-1B — specialty occupation, usually a U.S. employer as petitioner; IT, engineering, finance, healthcare, science, architecture and other professions. Many cases face an annual cap and lottery.
- L-1A managers and executives; L-1B specialized knowledge — transfer inside a related company, including firms opening a U.S. office.
- O-1 — extraordinary ability in science, business, education, sport, the arts, film and television. Awards, publications, press, leading roles, high earnings — the evidence depends on the category.
- Also: H-2A agricultural; H-2B seasonal; P athletes and artists; R certain religious workers. Each program has its own rules.

