Dr. Craig Allen standing in a burned-out tree in the Jemez mountains.

The recent recipient of two major awards, Craig D. Allen, a research ecologist with the U.S. Geological Survey Fort Collins Science Center, has loved trees since childhood. He is now considered an expert of world renown on the twin phenomena of forest changes and tree mortality resulting from warming and drought, and in 2010 was twice recognized for his scientific contributions. In March 2010, he...