Luthor
From The Stargate Omnipedia
Arms dealer on Earth who was given permission to run a market of illegal weaponry in exchange for a free flow of information with the N.I.D. Luthor often entertained the company of Agent Malcolm Barrett, who arrived to ask for information regarding individuals who had recently examined or purchased arms.
DETAILS
PLAYED BY - John Mann
FIRST APPEARED - Smoke and Mirrors
KEY EPISODE
Smoke and Mirrors - Barrett arrives at Luthor's facility alongside Major Carter to inquire about a recent shopper of illegal arms, Agent Devlin using alien technology to impersonate Colonel O'Neill.