An American writer, producer, and screenwriter, he is best known for founding Dark Horse Comics and Dark Horse Entertainment. His screenwriting credits include The Mask and Timecop.
Early in his career, he worked as a producer on a film called Barb Wire. The movie was nominated for a Razzie Award for the Worst Picture of 1996.
He won an Emmy in 2007 for Hellboy: Sword of Storms.
He settled in Lake Oswego, Oregon with his wife and children.
He produced The Mask starring Jim Carrey.