David Quammen, a St. X alum (Class of 1966), is an author and journalist whose fifteen books include The Song of the Dodo (1996), The Reluctant Mr. Darwin (2007), and Spillover (2012). His latest book is Yellowstone: A Journey through America’s Wild Heart, which is an expanded version of the May 2016 special issue of National Geographic on the Greater Yellowstone Ecosystem, with text by Mr. Quammen and photos by a team of eight photographers, including keynote speaker Michael Nichols.