Barry N. Malzberg wrote in The Science Fiction of Mark Clifton that "Clifton was an innovator in the early 1950s and such an impressive innovator that his approach has become standard among science fiction writers.
În The Science Fiction of Mark Clifton, Barry N. Malzberg scria: "Clifton a fost un inovator al începutului anilor '50 de o asemenea magnitudine, încât abordarea sa a devenit un standard printre scriitorii de science fiction.