How to find out who created a custom table

I have searched the forum but didn't find an answer so thought I would put it out here.

I have a bunch of custom tables that have been created and not assigned to table groups. Some are SM30 wrappers and some aren't. They are all defaulted to &NC& which is a no-no to assign to roles. My question is, how can I see who created these tables so that I can contact them and educate them on table groups? I can't seem to figure this out.

For instance, I have a custom t-code that calls a custom view and the view is assigned to &NC& in TDDAT.

Any help appreciated