Otto Binder (1911-1974) wrote many science-fiction stories for early pulps, with "I, Robot" (Amazing Stories, January 1939) the best known. From 1939, he became hugely prolific in superhero comics, penning over half the total adventures of the Captain Marvel / Shazam extended universe for Fawcett Comics, writing most of the major characters at Timely (later Marvel) and Quality Comics, and co-creating dozens of DC Comics staples including the Legion of Super-Heroes, Supergirl, and Krypto the Super-Dog. His interest in science-fiction was motivated by a passion for space, and in later years he wrote speculatively about UFOs and edited Space World, a magazine about astronomics.