Andrei Koribanics freelanced for Hasbro in the mid-1980s.  Besides today’s Borer art, I’ve also come across a figure concept by him (that may end up in Chapter 14 of my book) and the presentation painting of Sgt. Slaughter’s Renegades (in Chapter 6).  Leaky Suit Brigade has a tiny interview with Koribanics, and should have a longer one up at some point.