I know some research assistant professor can later on find a
tenure-track independent investigator position. So there is hope there.




I am a Ph.D candidate in BioMed research field, i have the impression
that research assistant professor is better than research scientist,
but it's right that both are not tenure-track.



if the univeristy is top-rank, your husband's sponsor boss is a big
name in the field, I guess it does not hurt to stay as a research
assistant professor for a few years before he can find a independent
position. He should be able to get nice publications during this time
and more experiences.



good luck.