Douglas W. Smith has studied wolves for more than forty years. In 1994 he was hired by the National Park Service in Yellowstone National Park as the project biologist to reintroduce wolves, and in 1997 he became the project leader, a position he still holds today. Besides wolves in Yellowstone, he is also responsible for supervising the park's bird, elk, and beaver programs. He is coauthor, most recently, of Wolves on the Hunt: The Behavior of Wolves Hunting Wild Prey, also published by the University of Chicago Press. Daniel R. Stahler is the Yellowstone Wolf Project's lead biologist and the project leader of the Yellowstone Cougar Project. In addition, he helps manage the elk program and is Yellowstone National Park's threatened and endangered species coordinator, working with species like lynx, wolverine, and grizzly bears. Daniel R. MacNulty is associate professor of wildlife ecology in the Department of Wildland Resources at Utah State University and was one of the first volunteers hired by the Yellowstone Wolf Project. He is also coauthor of Wolves on the Hunt.