George is a self-proclaimed gambler and scavenger that can be found near Nellis Air Force Base. He says that he makes his money from gambling and "reclaiming goods that are no longer being used". He places double or nothing wagers with travelers, betting that they cannot get to the gate of Nellis AFB and back alive. Then, having tempted them to their doom, he loots their bodies.
Sometimes before or after you talk to him, and leave and come back or reload a save, he can be already dead, most likely blown to small chunky pieces. This will only happen if you go through the bombardment and retreat to try again or make it through and come back. However, most of the caps you spent can be taken back from his body, but sometimes reward he promised will not be present. There is no fix to this other than console commands or reloading a save.
George can be killed without a loss or gain in Karma.
Once you buy his instructions on how to get to Nellis, he runs away.