In Marvel Masterworks: Spectacular Spider-Man v2 (reprinted in Spectacular Spider-Man Omnibus v1), there's a text-piece by Marc Guggenheim talking about Bill Mantlo. It includes:
Quote Originally Posted by Marc Guggenheim
In his long tenure, Bill Mantlo's writing touched every corner of the Marvel Universe. He wrote everything from the icons(…) to the B-listers (Alpha Flight…)