David Quammen is an author and journalist who lives in Montana and travels widely for research, usually to jungles and mountains and swamps. His fifteen books include The Song of the Dodo, The Reluctant Mr. Darwin, Spillover—a work on the science and history of dangerous zoonotic pathogens—including Ebola and HIV, and Yellowstone: A Journey through America’s Wild Heart. His forthcoming book, The Tangled Tree, will describe a radical new view of life’s history on Earth, arisen in recent decades from the work and the influence of a man named Carl R. Woese. David has written for Harper’s, The Atlantic, Rolling Stone, The New York Times Book Review, Outside, and Powder, among other magazines, and is a contributing writer for National Geographic. He shares a home in Bozeman, Montana, with his wife, Betsy Gaines Quammen, an environmental historian, and a continuing parade of orphan dogs and cats.