Dallas McCord "Mack" Reynolds (1917-1983) was a prolific science fiction and mystery writer of the 1950s and 1960s, with much of his work being published in several pulps of that era. Reynolds was an active socialist, and his works tend to reflect this. They are often set in utopian societies where Esperanto is used as a universal language (in a similar vein to the works of Harry Harrison). Reynolds' novella STATUS QUO was a Hugo nominee in 1961.