Final answer:
Carl Laemmle, founder of Universal Studios, started the star system with a media campaign for Florence Lawrence, changing how actors were marketed and perceived.
Step-by-step explanation:
The person who started the star system with a brilliant media campaign for Florence Lawrence was Carl Laemmle, the founder of Universal Studios. Before the star system, actors were not identified by name in films, but Laemmle's innovative approach to marketing helped turn performers like Lawrence into household names. This system fundamentally changed how actors were marketed and how the public perceived them, with stars becoming attractions in their own right, leading audiences to films on the basis of their appearance alone.