Cristina Eisenberg is a Smithsonian Research Associate, a Black Earth Institute Scholar, and the former Chief Scientist at Earthwatch Institute. She has published The Wolf's Tooth: Keystone Predators, Trophic Cascades, and Biodiversity and The Carnivore's Way: Coexisting with and Conserving America’s Predators. For the past 25 years she has lived with her family in a remote, wild corner of northwest Montana and also has a home in Concord, Massachusetts, near Walden Pond.