Horowitz

 is one of the few non-ghoulified denizens of Vault 34 to have remained alive in spite of the reactor meltdown.

Background
Horowitz was one of five non-ghoulified Vault 34 dwellers to have survived. He and a few others were trapped when someone detonated a bomb in the pool area, and left an SOS in the terminal outside the reactor room of Vault 34. If the player chooses to redirect control to the backup terminal where Horowitz is located, he will free himself and the other Vault 34 survivors, eventually finding their way to the Aerotech Office Park Suite 300, West and slightly south of Vault 34.

Appearances
appears in Fallout: New Vegas.

Bugs

 * if you had chosen to reroute power to the trapped Vault Dwellers in Vault 34, speaking to Horowitz will provide a dialogue option for a reward, a "Vault Trinket"; however, no item is added to your inventory. Also appears on Xbox 360