Here’s a piece from yesterday’s Mercury News. He’s not a pure investor. It’s part philanthropy:

I think the probability of humanity living longer is greater if we’re a multi-planet species. I think that’s fairly obvious. But I’m also quite optimistic about Earth. I don’t think Earth is in any danger of imminent demise. I think we will solve the problems that we have before us, and that humanity will probably live for a very long time.

But there’s always a chance that it could end. That’s why people buy life insurance. They don’t expect to drop dead tomorrow. Or car insurance. You don’t expect to T-bone your car into a semi. But you might. That’s why I’m a big believer in space exploration.

For me, space exploration is actually more interesting for positive reasons. I think humanity will be far more interesting and richer and diverse and just the future will be much more exciting and interesting if we are a space-faring civilization that is expanding among the stars than if we’re forever on Earth.

That’s the attitude I’d have if I had his kind of money.