Think the date is 95 just in case that helps at some point..
I thought American Studio glass is often signed around the outside of the piece so might be looking outside America for maker?
I can't make anything out of the sig at all, I'm sorry. It's not your photo (they are a complete pain to photograph when done in the pontil mark), but the mark is quite indistinct. The first letter looks like a figure 8 but might be a B?