That's as true as a thing can be, given that Liefeld co-created the character for Marvel Comics in the early '90s with Fabian Nicieza. But he's also been a champion of the movies the whole way ...
Co-created with writer Fabian Nicieza, Deadpool has grown into one of Marvel’s most popular characters, but there are relatively few comics starring the Merc with the Mouth drawn by Liefeld himself.