James Montgomery Flagg (1877 - 1960) painted arguably the most famous poster in history: Uncle Sam saying "I Want You" (for which he was the model). Successful in most mediums and styles, from cartoons (a very strange sense of humor) to pretty girls (Elvgren sites him as a favorite). Output includes stories, covers, and ads, and did the first "Jeeves" for PG Wodehouse. In demand for his portraiture throughout his life, he was as much a celebrity as the Hollywood and Broadway types he painted and befriended. He also worked on short silent films.