Les Johnson

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, one of the coolest jobs in the universe. In the early 2000s, he was NASAs Manager for Interstellar Propulsion Research and later managed the In-Space Propulsion Technology Project. He was technical consultant for the movie Lost in Space and has appeared on the Discovery Channel series, _Physics of the ImpossibleÓ in the _How to Build a StarshipÓ episode. He has also appeared in three episodes of the Science Channel series, Exodus Earth. In his spare time he writes popular science books and articles, including Solar Sails: A Novel approach to Interplanetary Travel, Living Off the Land in Space: Green Roads to the Cosmos and Paradise RegaineThe Regreening of Earth.