Robert Liefeld is an American comic book creator. A prominent writer and artist in the 1990s, he is known for co-creating the character Cable with writer Louise Simonson and the character Deadpool with writer Fabian Nicieza. In the early 1990s, Liefeld gained popularity due to his work on Marvel Comics' The New Mutants and later X-Force. In 1992, he and several other popular Marvel illustrators left the company to found Image Comics, which started a wave of comic books owned by their creators rather than by publishers. The first book published by Image Comics was Liefeld's Youngblood #1.