If you have a facebook account, maybe look up the local catfish clubs and ask in there. 3 Rivers Catfish Club is one, I know of one in Beaver County too but that's too far away. He may end up meeting a friend he can fish with more than once.
I've never seen an Allegheny River catfish guide advertise, I have seen them for Susquehanna and Erie for catfish, registered with the state and insured captains. Most Allegheny River guides do muskie and smallmouth but may do catfish