About the Author
Les Johnson is a NASA physicist, manager, author, husband and father. By day, he serves as the Deputy Manager for the Advanced Concepts Office at the NASA George C. Marshall Space Flight Center in Huntsville, Alabama. Johnson is also an on-screen consultant and commentator for National Geographic Channel special programming, including Evacuate Earth. He is the co-author with Travis S. Taylor of science fiction thriller Back to the Moon from Baen Books.