Ace, along with Ballantine Books, was one of the leading science fiction publishers for its first ten years of operation. The death of owner A. A. Wyn in 1967 set the stage for a later decline in the publisher's fortunes. That was delayed several years by the Ace Science Fiction Specials series, prominent in science fiction awards and nominations for novels published from 1968 to 1970. Two leading editors, Donald A. Wollheim and Terry Carr, left in 1971, and in 1972 Ace was sold to Grosset & Dunlap. Despite financial troubles, there were further successes, particularly with the third Ace Science Fiction Specials series, for which Carr came back as editor. Further mergers and acquisitions resulted in the company becoming absorbed by Berkley Books. Ace later became an imprint of Penguin Group (USA).