Dr. Travis S. Taylor heads up the cast of The Secret of Skinwalker Ranch and can be seen on The Machines that Built America on the History Channel. He has worked on various programs for the Department of Defense and NASA for the past twenty years. His expertise includes advanced propulsion concepts, very large space telescopes, space-based beamed-energy systems, future combat technologies, and next-generation space launch concepts. Taylor is also the author of pulse-pounding, cutting-edge science fiction novels, including the highly popular One Day on Mars, Tau Ceti Agenda, and the groundbreaking Warp Speed series. He is a regular on the History Channel's Life After People and The Universe series.