Besides his own writings, he edited a number of anthologies. For Faber he edited "Introducing SF", a collection of stories typifying various themes of science fiction, and "Best Fantasy Stories". In 1961, he edited an anthology of reprinted short science fiction for the British paperback publisher Penguin Books under the title "Penguin Science Fiction". This was remarkably successful, went into numerous reprints, and was followed up by two further anthologies: "More Penguin Science Fiction" (1963) and "Yet More Penguin Science Fiction" (1964). The later anthologies enjoyed the same success as the first, and all three were eventually published together as "The Penguin Science Fiction Omnibus" (1973), which also went into a number of reprints. In the 1970s, he produced several large collections of classic grand-scale science fiction, under the titles "Space Opera" (1974), "Space Odysseys" (1975), "Galactic Empires" (1976), "Evil Earths" (1976), and "Perilous Planets" (1978). Around this time, he edited a large-format volume "Science Fiction Art" (1975), with selections of artwork from the magazines and pulps.