Zak Penn. Writer: Ready Player One. Zak Penn's career began as a screenwriter when he sold his first script, Last Action Hero, at the age of twenty-three. Since then, Penn has become known for his work on numerous films based on Marvel comics, including X-Men 2 and X-Men: The Last Stand, The Incredible Hulk, and The Avengers. He has also dabbled in other genres, writing scripts for disparate films such...