Sam Hamm.

comics writer · screenwriter

United States, Born 1955

In short

Sam Hamm (born November 19, 1955) is an American screenwriter and comic book writer. Hamm is known for writing the initial drafts of the screenplay for Batman (1989) before those duties were handed over to Warren Skaaren. He also received a story credit for Batman Returns, though the final version of the film differs significantly from his ideas.