L. David Mech is a senior research scientist with the US Geological Survey and an adjunct professor in the Department of Fisheries, Wildlife, and Conservation Biology and Department of Ecology, Evolution, and Behavior at the University of Minnesota. He is the author or editor of many books, including Wolves: Behavior, Ecology, and Conservation, coedited by Luigi Boitani and published by the University of Chicago Press. Douglas W. Smith is a senior wildlife biologist and the Wolf Project Leader in Yellowstone National Park. He is coauthor most recently of Decade of the Wolf: Returning the Wild to Yellowstone. Daniel R. MacNulty is an assistant professor of wildlife ecology at Utah State University.