A U.S. employer may sponsor a prospective or current foreign national employee who is inside or outside the United States and who may qualify under one or more of the employment-based (EB) immigrant visa categories. Generally, aliens with extraordinary ability in the sciences, arts, education, business, or athletics; outstanding professors and researchers; professionals with advanced degree or persons with exceptional ability, can apply an employment-related visa (e.g. H1-B, J-1) which allows the employee to work for a particular employer.