If you are a university professor, you have the following options for your green card:
Labor Certification (optional special recruitment): if your university has conducted a competitive recruitment and selection process on your behalf within 18 months of your selection through advertising in a national publication, a labor certification may be filed on behalf of you without any further recruitment.
Labor Certification (Schedule A, Group II): if you are a university teacher in the sciences or arts with international recognition for previous years and intend to practice in same field, you may file this pre-certified labor certification along with your immigrant petition and/or adjustment of status.