Forty

 is a slaver at Paradise Falls and is Eulogy Jones' (fairly dim-witted) second-in-command in the year 2277.

Background
Forty was born in 2222.

Eulogy's second in command earned his nickname from the fact that, throughout his life, he's killed 40 men. However, killing slaves is something Forty considers "sport" and doesn't count toward his total.

Interactions with the player character
The Lone Wanderer will first meet Forty outside the entrance. Many will think Forty shot the escaping slave. Then, through a conversation with you, he will explain about the Slave Collar. Afterwards, he will never engage in proper conversation with you, simply telling you to "piss off"--unless you are following the Rescue from Paradise quest, then he will have a conversation where you can "distract" him.

Apperances
 only appears in Fallout 3.