"I think the most important thing is to make sure that we have a path to a sustainable energy future, and to become a multi-planet species."

"I tend to be a little bit of an optimist, but I also tend to be a little bit of a realist."

"I think we're at the dawn of a new age of space exploration."

"I'm not a fan of people who are not passionate. I think it's important to be passionate about what you do."

"I hope you don’t think I’m trying to be manipulative. I’m not. I’m just trying to make sure that humanity has a future."