One of the first names that comes to mind when you mention "wildlife photographer" is Tom Mangelsen. If you've ever been through the Denver airport, you're also likely to recognize the name.
On the final day of shooting at the Summit Series nature photography workshop, I had the privilege of shooting with him. He's a genuine guy and a pleasure to learn from. He took us to some of his usual haunts in the Tetons. Even did a little unplanned 4x4'ing! Wildlife was scarcer than usual but we found some bison in lovely tall grass (think about your backgrounds!).
The workshop also gifted participants with a copy of Tom's most recent book, "The Grizzlies of Pilgrim Creek." It's a beautiful piece of work. I had mine signed, of course!
You can get your own copy online or at an upcoming book signing.