Jeff Strayer

 was the father of Ted Strayer, a young man who lives in Rivet City at the time of Fallout 3.

Along with Mister Crowley, Dave and Tara Fields he was a member of a failed expedition Allistair Tenpenny sent to Fort Constantine to retrieve a rare weapon. Strayer was in possession of one of the keys needed to gain access to the Weapons R&D laboratory in the Fort, location of a suit of T-51b Power Armor. After he passed away, his son inherited this key.

In Andale, after coming out of either the shed or the Smith's basement, you can do a speech challenge in which one of the residents will quote other people who have been in there. One of the quotes is, "Please not me, I have a kid in Rivet city." This might be a hint to how Jeff Strayer died.