I don't think I could limit myself to one. I have had the pleasure to meet many wonderful photographers and not all of them known. Its the dialog I enjoy the best with all. Either here on APUG or through email or by calling.
Almost all have openned their homes, shared their work and thoughts on photography. That is the best way of education for me.
Happy Holidays to you all.
"We are what we repeatedly do. Excellence, then, is not an act but a habit"
I'd love to invite George Tice. What I think would make him such a worthy visiting artist is his gift for finding the special in the close to home, and everyday. That kind of gift is inspiring and would likely impart to students the motivation to look with renewed intensity at their immediate environment. Plus the fact that he's accessible and makes gorgeous prints (like Caponigro cited above). Of course, with all that going for him, other faculty would probably object because they'd be hard pressed to spin a fabric of art-speak theoretical kaka about what he does.......oh well! (I still want to be king though...okay?)
Not meant to blow smoke up his butt, but I would pick our own Sam Portera. Not only does he demonstrate fine mechanical skills in both large and small format as well as producing terrific prints, but he could teach the students something about persevering through adversity, and finding catharsis through the creation of art.