What Musk has developed that so many of the entrepreneurs in Silicon Valley lack is a meaningful worldview. Hes the possessed genius on the grandest quest anyone has ever concocted. Hes less a CEO chasing riches than a general marshaling troops to secure victory. Where Mark Zuckerberg wants to help you share baby photos, Musk wants to . . . well . . . save the human race from self-imposed or accidental annihilation.

Elon Musk by Ashlee Vance