Leopold is a bartender at the Arena Club.
Leopold was tending bar when Howard Stark and Edwin Jarvis came to the Arena Club to solicit membership. Stark asked for him for a martini while Torrance gave the prospective members a tour of the establishment. Minutes later, Stark was upset because Leopold had not yet made the drink. Jarvis offered assistance, but Torrance assured them that Leopold could make the martini.
Suddenly, Stark began fussing about how boring the Club was and allowed a bevy of ladies to enter the men-only establishment. Jarvis then approached Leopold and, as he began to make a martini, instructed Leopold on how to make it quickly.