I dont know if Onkelos was a Rabbi or had Semicha….
The Aruch haShulchan (CM 7:1) says that if a ger’s father is Jewish, than he is considered eligible to serve as a dayan in a case involving born Jews.
I believe both the Aruch HaShulchan and the Igros Moshe hold li’maaseh like this Rambam.
“If, as I think is the case, a Ger can be a Rabbi, then a woman can be a Rabbi.”
Pretty big if…
There are other reasons given for a woman not being able to be a rabbi, but I can’t remember whether they’re entirely disconnected from this or based on it…
writersoul: Some are connected to Serarah, some have other bases.
I don’t think the position of a shul rabbi, a mehanech, etc. counts as serarah.
A ger probably shouldn’t become a dayan, though, as he can’t judge born Jews, and a ger also cannot sit on a beis din for geirus.
R’ Moshe writes that a woman being a Mashgiach for a kashrus organization is a problem of serarah, unless she only acts as the eyes of the Mashgiach and does not enforce the rules herself (and even then, it’s possible that that would only be good enough in the bedieved case R’ Moshe was dealing with). It’s hard for me to see how being a Rabbi or Rebbi should be any better.
It’s interesting that women are totally in charge of the kashrus of their homes and Taharas HaMishpacha, but are not favored to routinely be mashgichos.
mw13: That is an ironic reversal of the point of R’ Moshe’s position.