Roc Books is a fantasy imprint of Penguin Group, as part of its New American Library. It was launched in April 1990 after Penguin Chairman Peter Mayer asked John Silbersack, the editor-in-chief of NAL's science fiction program, to launch a new imprint that would draw more attention to Penguin's SF presence. The name Roc Books was chosen as a homage to Penguin's many famous bird-named publishing imprints; the Roc was the enormous predatory bird in the Arabian Nights. After Penguin's merger with G.P. Putnam's Sons, the imprint was aligned with Ace books, with a common editorial team between the two.