Jeff Strayer never appears in Fallout 3 but his name is mentioned on a few occasions. He was part of a mercenary team hired by Allistair Tenpenny to retrieve a rare weapon from Fort Constantine. The other members were Dave, Dukov, Mister Crowley and Tara. The mission went wrong when Dave, Dukov and Jeff betrayed Mister Crowley and Tara died of a heart-attack.
Jeff's son Ted Strayer is now a resident of Rivet City. During an Unmarked quest in Andale called Our Little Secret, Jack Smith will mention that someone passed through the town who had a kid in Rivet City, this could of been how Jeff died or it could of been James Hargrave's dad.