Astrophysicist and space pioneer James Van Allen (1914-2006), for whom the Van Allen radiation belts were named, was among the principal scientific investigators for twenty-four space missions, including Explorer I in 1958, the first successful U.S. satellite; Mariner 2's 1962 flyby of Venus, the first successful mission to another planer; and the 1970's Pioneer 10 and Pioneer 11, missions that surveyed Jupiter and Saturn. Drawing on Van Allen's correspondence and publications, years of interviews with him as well as with more than a hundred other scientists, and declassified documents from such archives as the Jet Propulsion Laboratory, the Kennedy Space Center, and the Applied Physics Laboratory. Often called the father of space science, Van Allen led the way to mapping a new solar system based on the solar wind, massive solar storms, and cosmic rays. Foerstner's compelling biography charts the eventful life and times of this trailblazing physicist.