Furthermore the reason I believe him to be the most significant entrepreneur of all time is this... No one that I know of... has taken progressively larger fortunes and bet them on such high risk venture. No one ever has done that... Most people would have retired after zip2. Even a highly driven person would have probably become a venture capitalist after paypal... like Peter Thiel did. Also, no one that I know has come so publicly to the brink of failure and succeeded like Elon did in 2008. The underlying reason is no one has vision like he does. Going to Mars, and accelerating the transition to electric vehicles are huge ideas... The vision of going to Mars alone is in the same league as JFK and going to the moon. And that's just 1/2 of what is working on.