William S. Higgins works as a radiation safety physicist at Fermilab, where he is involved in the transport of high-energy particle beams. As a volunteer in NASA's Solar System Ambassador program, he speaks and writes about spaceflight, astronomy, and other topics in science and technology. He plays baritone ukulele, if not skillfully, then with enthusiasm. Long active in Chicago's science fiction fandom, he researches the intertwined history of SF and science. He's a member of General Technics, a fan group devoted to do-it-yourself technology.