Doc Hoff

Doc Hoff, or as he likes to call himself "The Good Doctor" (for his specialty in selling medicine and chems), is a caravan merchant in 2277.

Background
Sarcastic and pessimistic about humanity's survival, he sells food, medical supplies, and drugs, and may also repair your gear. Doc Hoff is convinced he's helping to ease humanity's suffering in its dying years, for a price.

Daily schedule
Doc Hoff appears outside of frequent stops every time you fast travel to that location, go through a loading screen to that location, or wait at the site for a couple of hours. A good way to find him is to fast travel to Rivet City and go down the metal stairs. If he isn't there, wait for one or two hours so a merchant spawns. If the merchant isn't Doc Hoff, wait for one or two hours again. Repeat until you get him to spawn.

Interactions overview
* After second investment.

Quests

 * Merchant Empire: After talking to Uncle Roe about caravan merchant investment, his repair skill jumps to 65 (allowing him to repair items to a max of 79%). His inventory (and the number of available caps) also improves, and after the second investment, he rewards you with 5-7 stimpaks, depending on your level.

Notable quotes

 * "Let's see what the good doctor has in his magic bag, shall we?"
 * "Here to see the good doctor? Excellent."
 * "Tell me what you need, and maybe I've got your fix."

Appearances
Doc Hoff only appears in Fallout 3.

Behind the scenes

 * The name Doc Hoff is probably a reference to Doctor Albert Hoffman, a Swiss scientist who was the first to synthesize LSD.

Bugs

 * Doc Hoff can appear at the Jefferson Memorial during the time of the quest "Take It Back". He is almost always instantly killed by Liberty Prime, and his body can be very difficult to find with all the dead Enclave soldiers. Fortunately, his corpse will take more time to disappear, making him easier to locate if you wait about five to seven days after you finish the mission.
 * When starting a new game, it is possible that Doc Hoff will spawn without his pack brahmin and caravan guard.