 He initiated Fantasy Press, a small press which published the work of authors such as E. E. Smith, Jack Williamson, Robert A. Heinlein and John W. Campbell, Jr.. Fantasy Press published a total of 46 titles in its lifetime, with two additional fantasy titles published under the subsidiary imprint, Polaris Press.Fantasy Press books were produced in limited print runs averaging 3,750 copies each, with between 250 and 500 copies of each title bearing a limited plate inserted after the title page that was numbered and autographed by the book's author.These constituted the first hardcover editions of many of these works, previously available only in used copies of magazines.