IAR: Investment Adviser Representative.
If he/she is a US resident, that is certainly easier for background check. Basically, same thing than RIAs (fingerprints,...)
Also if you have to register her / him at the SEC, even better (depending of AUM I think).
So, I don't see why you couldn't. I would ask your Lawyer, just in case, not for the citizenship requirement, but for the residency.