To qualify for a U.S. Green Card in the EB1 Outstanding Professors or Researchers category, the alien applicant should have an international reputation for being outstanding in an academic field, and have an job offer from a U.S. employer. Also, the foreign alien should have at least three years experience at either teaching or research in the relevant academic field. 

Not every employer can use the EB1 Outstanding Professors or Researchers category. The U.S. employer must be a qualified employer, which can be either a university or institution of higher education, or a department, division, or institute of a private research entity with at least three full-time researchers on staff. Also, the private U.S. employer will need to show a history of significant research achievements.