"Thor Hogan has put together a careful and comprehensive account of a failed space initiative that has provided cautionary insights for those planning the U.S. future in space. The nation chose not to go back to the Moon and on to Mars almost twenty years ago. It is embarked on that path now, and one can only hope the results are more positive this time around. Think where we could be by now if we had chosen the exploratory focus proposed by President George H.W Bush in 1989. Hogan's account makes it clear why that did not happen."
John Logsdon, The George Washington University
"From even before the beginning of the space age advocates have developed plans for the human exploration of Mars. It was a part of the long range plan of NASA in 1959 and has been a significant goal in NASA's efforts thereafter. In 1989 space advocates persuaded President George H.W. Bush to announce the Space Exploration Initiative, which would lead to a mission to Mars. Thor Hogan's study tells the details of this initiative for the first time, offering an important perspective on the still-born effort as it died a long death in the Washington bureaucracy."
Roger Launius, Smithsonian Institution