David W. Marshall, PhD, is a historian and archivist on the faculty of Texas Tech University, with thirty four years of experience as a researcher, instructor, professor and archivist. He is the author of Mountain Man: John Colter, the Lewis and Clark Expedition, and the Call of the American West. Keith Sellon-Wright is an audiobook narrator and an actor with more than thirty years of experience in Hollywood. His television roles have included Frasier, Seinfeld, The West Wing, Mad Men, Parks and Recreation, Grey's Anatomy, and Scandal. He also serves as a voice of the New York Times, narrating selected articles for their daily audio edition.