One example is Outstanding Researcher (highest preference category) EB1-OR, which can actually be filed in parallel with an application in a lower preference ca

One example is Outstanding Researcher (highest preference category) EB1-OR, which can actually be filed in parallel with an application in a lower preference category. Technically a PhD isn't necessary, but you're almost certain to have a PhD if you meet the actual requirements. If you have international recognition as being outstanding in a field, or significant experience in teaching or research, or you enter in a position of tenure at a university, you can accelerate your green card application with EB1-OR.