Sam Hamm is an American screenwriter, perhaps best known for writing the screenplay for Tim Burton's Batman and an unused screenplay for the sequel. As a result of his work, he was invited to write for the Batman comic. The result was Batman: Blind Justice, which introduced Bruce Wayne's mentor, Henri Ducard, who later appeared in Batman Begins. Hamm's other screen credits include Never Cry Wolf and Monkeybone. He also wrote unused drafts for Planet of the Apes and Watchmen adaptations.
If Batman 1989 is the best of the Burton Batman movies followed by Batman Returns, this would be the third. If you're a fan of those and wish to see what a sequel in that universe could have been like this is certainly that.