Stan Lee revolutionized comics.
He worked with Jack Kirby and Steve Ditko.
He co-created fictional characters including Spider-Man, the Hulk, Doctor Strange, the Fantastic Four, Daredevil, Black Panther, the X-Men. He co-wrote with Larry Lieber. The characters Ant-Man, Iron Man, and Thor were co-written.
He made comic characters with more complex personal lives and more vulnerabilities. Previously the superhero comics were dominated by Superman and Wonderwoman.
Stan Lee also created fantastic villains. He created Dr. Doom, Galactus and many other villains.
In recent years, Stan Lee had cameos in almost every Marvel Comic related movie.