Alexander is a salesman for the Gun Runners and appears beneath the 188 trading post in the Mojave Wasteland. He also makes trips to Camp McCarran and Hoover Dam around once or twice a week, to make sales and to take gun and ammunition orders. He usually just stays at the trading post because caravans take that route to avoid the I-15. He also checks his and their stock and directs their shipment deliveries. He must also make very good money as he states he is able to visit the Strip once a month and still save money for retirement.
He acts very rude to the player character when first talking to him, but after a Guns check of 40, he will allow you to buy from him. He sells weapons, ammunition, and weapon mods. He will not attack the player unless provoked physically.
If you attack anyone at the Gun Runners base before fast traveling to the 188, he and his guard will become hostile and attack the player when you become visible.