Joe Cobb

 is the leader of a group of escaped convicts known as the Powder Gangers in 2280.

Background
He is looking for a man named Ringo, who has taken refuge at Goodsprings.

Interactions with the player character
The player can assist him in attacking a town, or kill him and save Goodsprings from his gang.

Appearances
appears in Fallout: New Vegas.

Trivia
Joe Cobb may be a reference to the character Jayne Cobb, a mercenary on the TV show 'Firefly', as the series is set in a wild west like setting, much like fallout: New Vegas.