What is the difference between O-1 and EB-1(A)?
The O-1 category applies to foreign nationals seeking a nonimmigrant status, while the EB-1(A) category is for foreign nationals seeking permanent immigrant status. A person seeking O-1 status must have an employer in the U.S., while a person seeking permanent residence in the EB-1(A) category does not need a U.S. employer.