I've always been a fan of Diane Cook and Len Jenshel. I think that they are 2 of the best and smartest landscape photographers working today. They have a new website up with much of their best work (here). Len's photos caught my eye years ago with the Travel West images. Since then the good pictures have kept coming.
It is unusual to see photographers work together. In general we collaborate poorly. That Len and Diane have found a way to shoot together and stay married is astounding. Len told me that they did not even know which one of them was firing the camera during the Green Roof story.
They are also two of the nicest people I know.