Doubleday is an American publishing company. It was founded as the Doubleday & McClure Company in 1897 and was the largest in the United States by 1947. It published the work of mostly U.S. authors under a number of imprints and distributed them through its own stores. In 2009 Doubleday merged with Knopf Publishing Group to form the Knopf Doubleday Publishing Group, which is now part of Penguin Random House. In 2019 the official website presents Doubleday as an imprint, not a publisher.