回复：About EB1-OR ---- To Xiaobaitu, Radiology, WorthIt or anyo

employer who sponsor you is the institute not your boss whom you work with.

permanent job offer letter should have such as "permanent" or "indefinite" words, if the position is other than tenured.

OR sometime face RFE for hiring you using "hard" money not "soft" money in universities or national labs. And RFE asked "qualification" of private research institute.