In 1937 Wollheim founded the Fantasy Amateur Press Association, whose first mailing (July 1937) included this statement from him: "There are many fans desiring to put out a voice who dare not, for fear of being obliged to keep it up, and for the worry and time taken by subscriptions and advertising. It is for them and for the fan who admits it is his hobby and not his business that we formed the FAPA." In 1938, with several friends, he formed the Futurians—arguably the best-known of the science fiction clubs. At one time or another, the membership included Isaac Asimov, Frederik Pohl, Cyril Kornbluth, James Blish, John Michel, Judith Merril, Robert A. W. Lowndes, Richard Wilson, Damon Knight, Virginia Kidd, and Larry T. Shaw. In 1943 Wollheim married fellow Futurian Elsie Balter (1910–1996). It proved to be a lasting marriage and publishing partnership.