It doesn't really matter where your Ph.D. is from or what subject/area of study it is. If you have a job offer from a research/reputed university or research lab/government agency, you are fine. The job offer has to be in your area, of course, they won't hire you as a professor/researcher in an unrelated area any way. Best, tenure-track professor position, and your chances are 100%. A friend of mine had a Ph.D. from an Indian univ., did a post-doc at a US state university for three years, had a tenure-track offer from another state university (not top 20, but still research and teaching doctoral degree-granting university), appllied for greeen card and got it in four and half months this April. He had some good journal publications also in his field. By the way, he is in social science, so the hoopla like you need to have degree in hard sciences is just bogus! It's that simple if you have a good job offer and some publications. Then, you can also file for EB1/ outstanding researcher/professor. The friend I was talking about filed under both categories and was approved for both. Lucky of him. Good luck, guys. But I'm heading Nepal next month.