It is possible.

In the last few months, PSA has hired about half a dozen ground instructors (ground school/IPT's/systems) and a couple sim instructors.

Personally, I have only flown with one guy that came to PSA from Air Wisconsin. I am sure that he got fired from AWAC, and was not at PSA long either. I am sure that he is the exception to the rule at AWAC. Everyone else that I have met from there has been great.