Post doc is not a title for a permanent position. You have to change it to research scientist or research associate for EB1b. But first your boss has to agree it, and your school has to allow it. I know some schools don't provide research scientist title for foreigners without green card.
c*a
8 楼
Don't be so sure. At least I know postdoc at DFCI at Harvard can all get EB1B sponsor from the institute. But it is very rare. It depends on whether you can convince them to get you a letter.