Waldrop interviewed dozens of contemporaries and examined reams of notes and primary sources to compose this massive biography of influence that stretches from MIT to the Pentagon to Xerox PARC and far beyond. If it sometimes seems that Licklider was a little too well beloved, especially in comparison to some of the more colorful figures in computing's recent history, it is worth remembering that his patience and humility were the very qualities that helped deliver the home-computing revolution we take for granted today. If we had to choose just one 20th-century computer pioneer that we couldn't do without, it would have to be the man behind the Dream Machine.