I used to think of him as Heinlein's "D.D. Harriman" (The Man Who Sold the Moon) in real life. But the more he shoots his mouth off and pulls silly stunts, the more I think of his Mars ideas as the Ultimate Doomsday Prepper, with plans for an out of this world bunker - on Mars.

To be fair, he did more than anyone else to push acceptance of electric cars, to take them from boring to desirable. He also moved the launch business to re-usable and closer to commonplace.

But when he opens his mouth, it can make it hard to remember the good things.