They include Amazon.com Chief Executive Jeff Bezos, computer game programmer John Carmack and rocketeer Jeff Greason.

VOA: special.2009.12.18

John Carmack, the guy who wrote the Doom computer game is now designing rockets in Texas.

NPR: Tech Tycoons' Dream: My Own Private Spaceship

John Carmack, the videogame programmer and cofounder of id Software, has a rocketry startup called Armadillo Aerospace.

FORBES: On The Cover/Top Stories

Legendary videogame designer John Carmack --creator of games like Doom and Quake, and founder of id Software --owns rocket-technology startup Armadillo Aerospace .

FORBES: The New Space Race