How to apply for a greencard as a distinguished researcher (EB-1a/b), or an extraodinary person with national interested waiver (EB-2 NIW)

(Disclaimer: This is my personal understanding with some personal experience and experience from some friends. Presented here as additional information for friends. There is no guarantee or implication of gurantee on anything.)

There are many ways to apply for greencards in United States. In large there are two categories: family-based (you are a relative of a United States citizen) or employment-based (you are employed or potentially employed by a US institute, company, government agency and etc).

Employment-based (EB) green cards are divided into a few priorities. For most of the researchers/engineers who receive their advanced professional degree (e.g. Ph.D), they are easily eligible for at least EB2 (second category of employment-based greencards). The small subset of them who can convincingly demonstrate to be "distinguished", are qualified for EB1 (the category with highest priority), another small subset of them whose work can be considered as of national interests to US can apply EB2-NIW, which has the same priority of normal EB2 applications but with some convenient exceptions such as requirement of existing jobs and change of jobs. For details of these priorities, see Department of State's Operation of the Numerical Control Process.

This document summarizes the steps to apply for EB1 or EB2-NIW, assuming the reader an individual with experience on research (and writing academic papers) and is qualified for either of these two categories.

Full process of employment-based greencard application:

The full process of EB green card application is parallel with 4 processes: qualification (form 140), adjust of status(form 485), working authorization (form 765) and advanced pararol (form 131). The dependency of these processes are depicted by the following state diagrams:

Legend:
Purple:actions by applicants
Red: process handled by Department of States
Blue: process handled by USCIS
Black: process handled by agents such as FBI
Green:No need for EB1 or NIW applicants. For other EB-2/EB-3 applicants only. List here for comparison.
Notes:

Detailed steps:

Usually, an applicant with Ph.D degree, or experience professionals with master degress, can apply for either EB-1 or EB-2. There are a few steps in the applications for the I-140:

The 485 part is relatively straight-forward paperworks. You can find lots of advice from Internet, or find a lawyer to do them. Again, you are the person that holds the final responsibility -- make sure you double-check everything before sending out (forms filled by lawyers, medical examiners and etc if allowed)