I can't find very many pix of him as a young man, but looking at pix of him now I'm betting that's John Romita Sr.
Can't say as I've ever had very much exposure to Brunner's stuff. I'm not a sword-and-sorcery fan; Dr. Strange is the title listed there I'm most likely to have looked at, and I don't think I have any Brunner issues. Frazetta-lite is my first impression too, but then that's my impression of the whole genre really.