In 1996, Penguin Group (USA) bought the Putnam Berkley Group, and kept Ace as its SF imprint. As of December 2012, recently published authors included Joe Haldeman, Charles Stross, Laurell K. Hamilton, Alastair Reynolds, and Jack McDevitt. Penguin joined together with Random House in 2013 to become Penguin Random House, which continues to own Berkley. Ace's editorial team is also responsible for the Roc Books imprint, although the two imprints have a separate brand identity.