Robert Zubrin is president of Pioneer Astronautics, an aerospace R&D company, and the founder and president of the Mars Society, an international organization dedicated to furthering the exploration and settlement of Mars by both public and private means. He lives with his wife, Hope, a science teacher, in Golden, Colorado.
Richard Wagner is the former editor of Ad Astra, the journal of the National Space Society. He lives in Northhampton, Massachusetts.
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